diff --git a/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.Compression.targets b/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.Compression.targets
index 1042c438908f..4bd2e53ba420 100644
--- a/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.Compression.targets
+++ b/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.Compression.targets
@@ -161,11 +161,12 @@ Copyright (c) .NET Foundation. All rights reserved.
   </PropertyGroup>
 
   <PropertyGroup>
-    <BuildCompressionFormats>$(BuildCompressionFormats);gzip</BuildCompressionFormats>
-    <PublishCompressionFormats>$(PublishCompressionFormats);gzip;brotli</PublishCompressionFormats>
+    <EnableDefaultCompressionFormats Condition="'$(EnableDefaultCompressionFormats)' == ''">true</EnableDefaultCompressionFormats>
+    <BuildCompressionFormats Condition="'$(EnableDefaultCompressionFormats)' == 'true'">$(BuildCompressionFormats);gzip</BuildCompressionFormats>
+    <PublishCompressionFormats Condition="'$(EnableDefaultCompressionFormats)' == 'true'">$(PublishCompressionFormats);gzip;brotli</PublishCompressionFormats>
     <DisableBuildCompression Condition="'$(DisableBuildCompression)' == ''">false</DisableBuildCompression>
-    <CompressionIncludePatterns>$(CompressionIncludePatterns)</CompressionIncludePatterns>
-    <CompressionExcludePatterns>$(CompressionExcludePatterns)</CompressionExcludePatterns>
+    <!-- Support passing in a custom compression level to brotli and respect the old internal flag for blazor -->
+    <BrotliCompressionLevel Condition="'$(_BlazorBrotliCompressionLevel)' != ''">$(_BlazorBrotliCompressionLevel)</BrotliCompressionLevel>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -195,7 +196,7 @@ Copyright (c) .NET Foundation. All rights reserved.
           GeneratePublishCompressedStaticWebAssets
             ResolvePublishCompressedStaticWebAssetsConfiguration
      -->
-    <ResolvePublishRelatedStaticWebAssetsDependsOn Condition="'$(DisableBuildCompression)' != 'true'">
+    <ResolvePublishRelatedStaticWebAssetsDependsOn>
       ResolvePublishCompressedStaticWebAssets;
       $(ResolvePublishRelatedStaticWebAssetsDependsOn)
     </ResolvePublishRelatedStaticWebAssetsDependsOn>
@@ -216,7 +217,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     <_DotNetHostFileName Condition="'$(OS)' == 'Windows_NT'">dotnet.exe</_DotNetHostFileName>
   </PropertyGroup>
 
-<!-- Build -->
+  <!-- Build -->
 
   <Target Name="ResolveBuildCompressedStaticWebAssets" DependsOnTargets="$(ResolveBuildCompressedStaticWebAssetsDependsOn)">
     <DefineStaticWebAssets
@@ -265,7 +266,7 @@ Copyright (c) .NET Foundation. All rights reserved.
 
     <BrotliCompress Condition="'@(_BrotliCompressedStaticWebAssets)' != ''"
       FilesToCompress="@(_BrotliCompressedStaticWebAssets)"
-      CompressionLevel="$(_BlazorBrotliCompressionLevel)"
+      CompressionLevel="$(BrotliCompressionLevel)"
       ToolAssembly="$(_StaticWebAssetsSdkToolAssembly)"
       ToolExe="$(_DotNetHostFileName)"
       ToolPath="$(_DotNetHostDirectory)" />
diff --git a/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.targets b/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.targets
index c922d5b571c8..fd3f1f68c2bd 100644
--- a/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.targets
+++ b/src/StaticWebAssetsSdk/Targets/Microsoft.NET.Sdk.StaticWebAssets.targets
@@ -660,7 +660,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     DependsOnTargets="ResolveStaticWebAssetsConfiguration;UpdateExistingPackageStaticWebAssets">
 
     <DefineStaticWebAssets
-      CandidateAssets="@(Content)"
+      CandidateAssets="@(Content->Distinct())"
       FingerprintCandidates="$(StaticWebAssetsFingerprintContent)"
       FingerprintPatterns="@(StaticWebAssetFingerprintPattern)"
       RelativePathPattern="wwwroot/**"
diff --git a/src/StaticWebAssetsSdk/Tasks/ApplyCompressionNegotiation.cs b/src/StaticWebAssetsSdk/Tasks/ApplyCompressionNegotiation.cs
index 0297ff5127fe..3cb90c598fc3 100644
--- a/src/StaticWebAssetsSdk/Tasks/ApplyCompressionNegotiation.cs
+++ b/src/StaticWebAssetsSdk/Tasks/ApplyCompressionNegotiation.cs
@@ -23,15 +23,40 @@ public class ApplyCompressionNegotiation : Task
 
     public override bool Execute()
     {
-        var assetsById = CandidateAssets.Select(StaticWebAsset.FromTaskItem).ToDictionary(a => a.Identity);
+        var assetsById = new Dictionary<string, StaticWebAsset>(CandidateAssets.Length, OSPath.PathComparer);
 
-        var endpointsByAsset = CandidateEndpoints.Select(StaticWebAssetEndpoint.FromTaskItem)
-            .GroupBy(e => e.AssetFile)
-            .ToDictionary(g => g.Key, g => g.ToList());
+        // A good rule of thumb is that the number of compressed assets is half the number of assets.
+        var compressedAssets = new List<StaticWebAsset>(CandidateAssets.Length / 2);
 
-        var compressedAssets = assetsById.Values.Where(a => a.AssetTraitName == "Content-Encoding").ToList();
-        var updatedEndpoints = new HashSet<StaticWebAssetEndpoint>(StaticWebAssetEndpoint.RouteAndAssetComparer);
+        for (var i = 0; i < CandidateAssets.Length; i++)
+        {
+            var candidate = StaticWebAsset.FromTaskItem(CandidateAssets[i]);
+            if (assetsById.ContainsKey(CandidateAssets[i].ItemSpec))
+            {
+                Log.LogWarning("Detected duplicated asset '{0}'. Skipping the asset because it was already processed.", candidate.Identity);
+                continue;
+            }
+
+            assetsById[candidate.Identity] = candidate;
+            if (string.Equals(candidate.AssetTraitName, "Content-Encoding", StringComparison.Ordinal))
+            {
+                compressedAssets.Add(candidate);
+            }
+        }
 
+        var endpointsByAsset = new Dictionary<string, List<StaticWebAssetEndpoint>>(CandidateEndpoints.Length, StringComparer.OrdinalIgnoreCase);
+        for (var i = 0; i < CandidateEndpoints.Length; i++)
+        {
+            var endpoint = StaticWebAssetEndpoint.FromTaskItem(CandidateEndpoints[i]);
+            if (!endpointsByAsset.TryGetValue(endpoint.AssetFile, out var endpoints))
+            {
+                endpoints = [];
+                endpointsByAsset[endpoint.AssetFile] = endpoints;
+            }
+            endpoints.Add(endpoint);
+        }
+
+        var updatedEndpoints = new HashSet<StaticWebAssetEndpoint>(StaticWebAssetEndpoint.RouteAndAssetComparer);
         var preservedEndpoints = new Dictionary<(string, string), StaticWebAssetEndpoint>();
 
         // Add response headers to compressed endpoints
@@ -39,20 +64,20 @@ public override bool Execute()
         {
             if (!assetsById.TryGetValue(compressedAsset.RelatedAsset, out var relatedAsset))
             {
-                Log.LogWarning("Related asset not found for compressed asset: {0}", compressedAsset.Identity);
-                throw new InvalidOperationException($"Related asset not found for compressed asset: {compressedAsset.Identity}");
+                Log.LogWarning("Related asset '{0}' not found for compressed asset: '{1}'. Skipping asset", compressedAsset.RelatedAsset, compressedAsset.Identity);
+                continue;
             }
 
             if (!endpointsByAsset.TryGetValue(compressedAsset.Identity, out var compressedEndpoints))
             {
-                Log.LogWarning("Endpoints not found for compressed asset: {0} {1}", compressedAsset.RelativePath, compressedAsset.Identity);
-                throw new InvalidOperationException($"Endpoints not found for compressed asset: {compressedAsset.Identity}");
+                Log.LogWarning("Endpoints not found for compressed asset: '{0}' '{1}'. Skipping asset", compressedAsset.RelativePath, compressedAsset.Identity);
+                continue;
             }
 
             if (!endpointsByAsset.TryGetValue(relatedAsset.Identity, out var relatedAssetEndpoints))
             {
-                Log.LogWarning("Endpoints not found for related asset: {0}", relatedAsset.Identity);
-                throw new InvalidOperationException($"Endpoints not found for related asset: {relatedAsset.Identity}");
+                Log.LogWarning("Endpoints not found for related asset: '{0}'. Skipping asset", relatedAsset.Identity);
+                continue;
             }
 
             Log.LogMessage("Processing compressed asset: {0}", compressedAsset.Identity);
diff --git a/src/StaticWebAssetsSdk/Tasks/Compression/DiscoverPrecompressedAssets.cs b/src/StaticWebAssetsSdk/Tasks/Compression/DiscoverPrecompressedAssets.cs
index a4a7357fa0c6..e78120ac75c0 100644
--- a/src/StaticWebAssetsSdk/Tasks/Compression/DiscoverPrecompressedAssets.cs
+++ b/src/StaticWebAssetsSdk/Tasks/Compression/DiscoverPrecompressedAssets.cs
@@ -29,7 +29,19 @@ public override bool Execute()
         var candidates = CandidateAssets.Select(StaticWebAsset.FromTaskItem).ToArray();
         var assetsToUpdate = new List<ITaskItem>();
 
-        var candidatesByIdentity = candidates.ToDictionary(asset => asset.Identity, OSPath.PathComparer);
+        var candidatesByIdentity = new Dictionary<string, StaticWebAsset>(CandidateAssets.Length, OSPath.PathComparer);
+        for (var i = 0; i < candidates.Length; i++)
+        {
+            var candidate = candidates[i];
+            if (candidatesByIdentity.ContainsKey(candidate.Identity))
+            {
+                Log.LogMessage(MessageImportance.Low,
+                    "Detected duplicated asset '{0}'. Skipping the asset because it was already processed.",
+                    candidate.Identity);
+                return false;
+            }
+            candidatesByIdentity[candidate.Identity] = candidate;
+        }
 
         foreach (var candidate in candidates)
         {
diff --git a/test/Microsoft.NET.Sdk.Razor.Tests/StaticWebAssets/ApplyCompressionNegotiationTest.cs b/test/Microsoft.NET.Sdk.Razor.Tests/StaticWebAssets/ApplyCompressionNegotiationTest.cs
index 48524f5b6b6a..168a6cd0be20 100644
--- a/test/Microsoft.NET.Sdk.Razor.Tests/StaticWebAssets/ApplyCompressionNegotiationTest.cs
+++ b/test/Microsoft.NET.Sdk.Razor.Tests/StaticWebAssets/ApplyCompressionNegotiationTest.cs
@@ -1128,6 +1128,60 @@ string candidate when candidate.EndsWith(Path.Combine("compressed", "candidate.j
         ]);
     }
 
+    [Fact]
+    public void AppliesContentNegotiationRules_Issue59291()
+    {
+        var errorMessages = new List<string>();
+        var buildEngine = new Mock<IBuildEngine>();
+        buildEngine.Setup(e => e.LogErrorEvent(It.IsAny<BuildErrorEventArgs>()))
+            .Callback<BuildErrorEventArgs>(args => errorMessages.Add(args.Message));
+
+        var task = new ApplyCompressionNegotiation
+        {
+            BuildEngine = buildEngine.Object,
+            CandidateAssets = [
+                CreateCandidate(
+                    @"D:\work\investigations\aspnet-59291-repro\WebWorkers.Issue4\obj\Release\net9.0\compressed\4t6f7o5fzg-j538s5lvtp.gz",
+                    "SpawnDev.BlazorJS.WebWorkers",
+                    "Package",
+                    "spawndev.blazorjs.webworkers.empty.js.gz",
+                    "All",
+                    "All",
+                    "pjmz1tbrkh",
+                    "5QGGFe52U8tL8jO+4zNzscmjjpZSY1o1BGIJkV/RmI4=",
+                    @"D:\Nuget\spawndev.blazorjs.webworkers\2.5.30\staticwebassets\spawndev.blazorjs.webworkers.empty.js",
+                    "Content-Encoding",
+                    "gzip"
+            )],
+            CandidateEndpoints = [.. new StaticWebAssetEndpoint[]
+            {
+                new() {
+                    Route = "spawndev.blazorjs.webworkers.empty.js.gz",
+                    AssetFile = @"D:\work\investigations\aspnet-59291-repro\RazorClassLibrary1\obj\Release\net9.0\compressed\4t6f7o5fzg-j538s5lvtp.gz",
+                    ResponseHeaders = [
+                        new StaticWebAssetEndpointResponseHeader { Name = "Accept-Ranges", Value = "bytes" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "Cache-Control", Value = "no-cache" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "Content-Encoding", Value = "gzip" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "Content-Length", Value = "471" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "Content-Type", Value = "text/javascript" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "ETag", Value = "\u00225QGGFe52U8tL8jO\u002B4zNzscmjjpZSY1o1BGIJkV/RmI4=\u0022" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "Last-Modified", Value = "Fri, 09 Feb 2024 02:37:40 GMT" },
+                        new StaticWebAssetEndpointResponseHeader { Name = "Vary", Value = "Content-Encoding" }
+                    ],
+                    EndpointProperties = [
+                        new StaticWebAssetEndpointProperty { Name = "integrity", Value = "sha256-5QGGFe52U8tL8jO\u002B4zNzscmjjpZSY1o1BGIJkV/RmI4=" }
+                    ],
+                    Selectors = []
+                } }.Select(e => e.ToTaskItem())],
+        };
+
+        // Act
+        var result = task.Execute();
+
+        // Assert
+        result.Should().Be(true);
+    }
+
     [Fact]
     public void AppliesContentNegotiationRules_ProcessesNewCompressedFormatsWhenAvailable()
     {