diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfo.cs b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfo.cs
index aa4daf4a839bd..5ca8dfa8d1369 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfo.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfo.cs
@@ -461,7 +461,8 @@ public JsonPropertyInfo CreateJsonPropertyInfo(Type propertyType, string name)
 
         internal void CacheMember(JsonPropertyInfo jsonPropertyInfo, JsonPropertyDictionary<JsonPropertyInfo>? propertyCache, ref Dictionary<string, JsonPropertyInfo>? ignoredMembers)
         {
-            string memberName = jsonPropertyInfo.ClrName!;
+            Debug.Assert(jsonPropertyInfo.ClrName != null, "ClrName can be null in custom JsonPropertyInfo instances and should never be passed in this method");
+            string memberName = jsonPropertyInfo.ClrName;
 
             // The JsonPropertyNameAttribute or naming policy resulted in a collision.
             if (!propertyCache!.TryAdd(jsonPropertyInfo.Name, jsonPropertyInfo))
@@ -545,7 +546,7 @@ internal void InitializeConstructorParameters(JsonParameterInfoValues[] jsonPara
             foreach (KeyValuePair<string, JsonPropertyInfo?> kvp in PropertyCache.List)
             {
                 JsonPropertyInfo jsonProperty = kvp.Value!;
-                string propertyName = jsonProperty.ClrName!;
+                string propertyName = jsonProperty.ClrName ?? jsonProperty.Name;
 
                 ParameterLookupKey key = new(propertyName, jsonProperty.PropertyType);
                 ParameterLookupValue value = new(jsonProperty);
@@ -584,7 +585,8 @@ internal void InitializeConstructorParameters(JsonParameterInfoValues[] jsonPara
                 else if (DataExtensionProperty != null &&
                     StringComparer.OrdinalIgnoreCase.Equals(paramToCheck.Name, DataExtensionProperty.Name))
                 {
-                    ThrowHelper.ThrowInvalidOperationException_ExtensionDataCannotBindToCtorParam(DataExtensionProperty);
+                    Debug.Assert(DataExtensionProperty.ClrName != null, "Custom property info cannot be data extension property");
+                    ThrowHelper.ThrowInvalidOperationException_ExtensionDataCannotBindToCtorParam(DataExtensionProperty.ClrName, DataExtensionProperty);
                 }
             }
 
diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/SourceGenJsonTypeInfoOfT.cs b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/SourceGenJsonTypeInfoOfT.cs
index fdba40e285149..85cfa258d8703 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/SourceGenJsonTypeInfoOfT.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/SourceGenJsonTypeInfoOfT.cs
@@ -150,7 +150,8 @@ internal void AddPropertiesUsingSourceGenInfo()
                 {
                     if (hasJsonInclude)
                     {
-                        ThrowHelper.ThrowInvalidOperationException_JsonIncludeOnNonPublicInvalid(jsonPropertyInfo.ClrName!, jsonPropertyInfo.DeclaringType);
+                        Debug.Assert(jsonPropertyInfo.ClrName != null, "ClrName is not set by source gen");
+                        ThrowHelper.ThrowInvalidOperationException_JsonIncludeOnNonPublicInvalid(jsonPropertyInfo.ClrName, jsonPropertyInfo.DeclaringType);
                     }
 
                     continue;
diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs b/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs
index 29c8ff7ad4161..c774aaad5bca7 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs
@@ -228,9 +228,9 @@ public static void ThrowInvalidOperationException_ConstructorParameterIncomplete
         }
 
         [DoesNotReturn]
-        public static void ThrowInvalidOperationException_ExtensionDataCannotBindToCtorParam(JsonPropertyInfo jsonPropertyInfo)
+        public static void ThrowInvalidOperationException_ExtensionDataCannotBindToCtorParam(string propertyName, JsonPropertyInfo jsonPropertyInfo)
         {
-            throw new InvalidOperationException(SR.Format(SR.ExtensionDataCannotBindToCtorParam, jsonPropertyInfo.ClrName, jsonPropertyInfo.DeclaringType));
+            throw new InvalidOperationException(SR.Format(SR.ExtensionDataCannotBindToCtorParam, propertyName, jsonPropertyInfo.DeclaringType));
         }
 
         [DoesNotReturn]
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/MetadataTests/DefaultJsonTypeInfoResolverTests.JsonTypeInfo.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/MetadataTests/DefaultJsonTypeInfoResolverTests.JsonTypeInfo.cs
index de9082ad40b92..47259e4145f71 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/MetadataTests/DefaultJsonTypeInfoResolverTests.JsonTypeInfo.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/MetadataTests/DefaultJsonTypeInfoResolverTests.JsonTypeInfo.cs
@@ -720,6 +720,70 @@ public ClassWithParametrizedConstructorAndWritableProperties(int a, string b)
             }
         }
 
+        [Fact]
+        public static void SerializingTypeWithCustomNonSerializablePropertyAndJsonConstructorWorksCorrectly()
+        {
+            var resolver = new DefaultJsonTypeInfoResolver { Modifiers = { ContractModifier } };
+            var options = new JsonSerializerOptions { TypeInfoResolver = resolver };
+            string json = JsonSerializer.Serialize(new PocoWithConstructor("str"), options);
+            Assert.Equal("{}", json);
+
+            static void ContractModifier(JsonTypeInfo jti)
+            {
+                if (jti.Type == typeof(PocoWithConstructor))
+                {
+                    jti.Properties.Add(jti.CreateJsonPropertyInfo(typeof(string), "someOtherName"));
+                }
+            }
+        }
+
+        [Fact]
+        public static void SerializingTypeWithCustomSerializablePropertyAndJsonConstructorWorksCorrectly()
+        {
+            var resolver = new DefaultJsonTypeInfoResolver { Modifiers = { ContractModifier } };
+            var options = new JsonSerializerOptions { TypeInfoResolver = resolver };
+            string json = JsonSerializer.Serialize(new PocoWithConstructor("str"), options);
+            Assert.Equal("""{"test":"asd"}""", json);
+
+            static void ContractModifier(JsonTypeInfo jti)
+            {
+                if (jti.Type == typeof(PocoWithConstructor))
+                {
+                    JsonPropertyInfo pi = jti.CreateJsonPropertyInfo(typeof(string), "test");
+                    pi.Get = (o) => "asd";
+                    jti.Properties.Add(pi);
+                }
+            }
+        }
+
+        [Fact]
+        public static void SerializingTypeWithCustomPropertyAndJsonConstructorBindsParameter()
+        {
+            var resolver = new DefaultJsonTypeInfoResolver { Modifiers = { ContractModifier } };
+            var options = new JsonSerializerOptions { TypeInfoResolver = resolver };
+            string json = """{"parameter":"asd"}""";
+            PocoWithConstructor deserialized = JsonSerializer.Deserialize<PocoWithConstructor>(json, options);
+            Assert.Equal("asd", deserialized.ParameterValue);
+
+            static void ContractModifier(JsonTypeInfo jti)
+            {
+                if (jti.Type == typeof(PocoWithConstructor))
+                {
+                    jti.Properties.Add(jti.CreateJsonPropertyInfo(typeof(string), "parameter"));
+                }
+            }
+        }
+
+        private class PocoWithConstructor
+        {
+            internal string ParameterValue { get; set; }
+
+            public PocoWithConstructor(string parameter)
+            {
+                ParameterValue = parameter;
+            }
+        }
+
         [Fact]
         public static void JsonConstructorAttributeIsOverridenAndPropertiesAreSetWhenCreateObjectIsSet_LargeConstructor()
         {