diff --git a/src/EFCore/Metadata/IReadOnlyComplexProperty.cs b/src/EFCore/Metadata/IReadOnlyComplexProperty.cs
index 235453e26bb..ef056484ca3 100644
--- a/src/EFCore/Metadata/IReadOnlyComplexProperty.cs
+++ b/src/EFCore/Metadata/IReadOnlyComplexProperty.cs
@@ -91,7 +91,7 @@ string ToDebugString(MetadataDebugStringOptions options = MetadataDebugStringOpt
             }
 
             if ((options & MetadataDebugStringOptions.IncludePropertyIndexes) != 0
-                && ((AnnotatableBase)this).IsReadOnly)
+                && (this is RuntimeAnnotatableBase || this is AnnotatableBase { IsReadOnly: true }))
             {
                 var indexes = ((IProperty)this).GetPropertyIndexes();
                 builder.Append(' ').Append(indexes.Index);
diff --git a/src/EFCore/Metadata/IReadOnlyNavigation.cs b/src/EFCore/Metadata/IReadOnlyNavigation.cs
index 5dd9bc89ae2..eca258ab435 100644
--- a/src/EFCore/Metadata/IReadOnlyNavigation.cs
+++ b/src/EFCore/Metadata/IReadOnlyNavigation.cs
@@ -165,7 +165,7 @@ string ToDebugString(MetadataDebugStringOptions options = MetadataDebugStringOpt
             }
 
             if ((options & MetadataDebugStringOptions.IncludePropertyIndexes) != 0
-                && ((AnnotatableBase)this).IsReadOnly)
+                && (this is RuntimeAnnotatableBase || this is AnnotatableBase { IsReadOnly: true }))
             {
                 var indexes = ((INavigation)this).GetPropertyIndexes();
                 builder.Append(' ').Append(indexes.Index);
diff --git a/src/EFCore/Metadata/IReadOnlyProperty.cs b/src/EFCore/Metadata/IReadOnlyProperty.cs
index f8a80655c9f..be9a4c06802 100644
--- a/src/EFCore/Metadata/IReadOnlyProperty.cs
+++ b/src/EFCore/Metadata/IReadOnlyProperty.cs
@@ -433,7 +433,7 @@ string ToDebugString(MetadataDebugStringOptions options = MetadataDebugStringOpt
             }
 
             if ((options & MetadataDebugStringOptions.IncludePropertyIndexes) != 0
-                && ((AnnotatableBase)this).IsReadOnly)
+                && (this is RuntimeAnnotatableBase || this is AnnotatableBase { IsReadOnly: true }))
             {
                 var indexes = ((IProperty)this).GetPropertyIndexes();
                 builder.Append(' ').Append(indexes.Index);
diff --git a/src/EFCore/Metadata/IReadOnlySkipNavigation.cs b/src/EFCore/Metadata/IReadOnlySkipNavigation.cs
index d7017c74085..ffe835e8041 100644
--- a/src/EFCore/Metadata/IReadOnlySkipNavigation.cs
+++ b/src/EFCore/Metadata/IReadOnlySkipNavigation.cs
@@ -99,7 +99,7 @@ string ToDebugString(MetadataDebugStringOptions options = MetadataDebugStringOpt
             }
 
             if ((options & MetadataDebugStringOptions.IncludePropertyIndexes) != 0
-                && ((AnnotatableBase)this).IsReadOnly)
+                && (this is RuntimeAnnotatableBase || this is AnnotatableBase { IsReadOnly: true }))
             {
                 var indexes = ((ISkipNavigation)this).GetPropertyIndexes();
                 builder.Append(' ').Append(indexes.Index);