diff --git a/src/Assets/TestProjects/KitchenSink/TestApp/TestApp.csproj b/src/Assets/TestProjects/KitchenSink/TestApp/TestApp.csproj
index c66add5cd310..7d504ce99f55 100644
--- a/src/Assets/TestProjects/KitchenSink/TestApp/TestApp.csproj
+++ b/src/Assets/TestProjects/KitchenSink/TestApp/TestApp.csproj
@@ -18,6 +18,7 @@
     <TieredCompilationQuickJit>true</TieredCompilationQuickJit>
     <TieredCompilationQuickJitForLoops>true</TieredCompilationQuickJitForLoops>
     <StartupHookSupport>false</StartupHookSupport>
+    <CustomResourceTypesSupport>false</CustomResourceTypesSupport>
     <EventSourceSupport>false</EventSourceSupport>
     <UseSystemResourceKeys>true</UseSystemResourceKeys>
     <EnableUnsafeUTF7Encoding>false</EnableUnsafeUTF7Encoding>
diff --git a/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.props b/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.props
index 4ec923c2b15b..918aadc1a2f2 100644
--- a/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.props
+++ b/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.props
@@ -25,6 +25,11 @@ Copyright (c) .NET Foundation. All rights reserved.
 
     <!-- Turn off symbol publishing by default -->
     <CopyOutputSymbolsToPublishDirectory>false</CopyOutputSymbolsToPublishDirectory>
+
+    <!-- Trimmer defaults -->
+    <PublishTrimmed Condition="'$(PublishTrimmed)' == ''">true</PublishTrimmed>
+    <TrimMode Condition="'$(TrimMode)' == ''">link</TrimMode>
+    <TrimmerRemoveSymbols Condition="'$(TrimmerRemoveSymbols)' == ''">false</TrimmerRemoveSymbols>
   </PropertyGroup>
 
   <Import Sdk="Microsoft.NET.Sdk.Razor" Project="Sdk.props" />
diff --git a/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.targets b/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.targets
index 86bd989c2a2a..346cd1c1bc90 100644
--- a/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.targets
+++ b/src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.targets
@@ -50,11 +50,6 @@ Copyright (c) .NET Foundation. All rights reserved.
     <SelfContained>true</SelfContained>
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
 
-    <!-- Trimmer defaults -->
-    <PublishTrimmed Condition="'$(PublishTrimmed)' == ''">true</PublishTrimmed>
-    <TrimMode Condition="'$(TrimMode)' == ''">link</TrimMode>
-    <TrimmerRemoveSymbols Condition="'$(TrimmerRemoveSymbols)' == ''">false</TrimmerRemoveSymbols>
-
     <!-- Runtime feature defaults to trim unnecessary code -->
     <InvariantGlobalization Condition="'$(InvariantGlobalization)' == ''">false</InvariantGlobalization>
     <EventSourceSupport Condition="'$(EventSourceSupport)' == ''">false</EventSourceSupport>
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ILLink.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ILLink.targets
index ed233b7741fc..d3473dd8009a 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ILLink.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ILLink.targets
@@ -28,10 +28,20 @@ Copyright (c) .NET Foundation. All rights reserved.
        could be removed by the linker, causing a trimmed app to crash. -->
   <PropertyGroup Condition="'$(StartupHookSupport)' == '' And
                             '$(PublishTrimmed)' == 'true' And
-                            '$(_TargetFrameworkVersionWithoutV)' >= '6.0'">
+                            $([MSBuild]::VersionGreaterThanOrEquals($(_TargetFrameworkVersionWithoutV), '6.0'))">
     <StartupHookSupport>false</StartupHookSupport>
   </PropertyGroup>
 
+  <!-- We disable custom resource types for trimmed apps here so that the feature
+       switch can flow to the runtimeconfig.json. Custom resource types are disabled
+       by default since they may require assemblies, types or members that
+       could be removed by the linker, causing a trimmed app to crash. -->
+  <PropertyGroup Condition="'$(CustomResourceTypesSupport)' == '' And
+                            '$(PublishTrimmed)' == 'true' And
+                            $([MSBuild]::VersionGreaterThanOrEquals($(_TargetFrameworkVersionWithoutV), '6.0'))">
+    <CustomResourceTypesSupport>false</CustomResourceTypesSupport>
+  </PropertyGroup>
+
   <!--
     ============================================================
                      ILLink
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
index 8df343516df3..84da5b0bef2b 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
@@ -426,6 +426,11 @@ Copyright (c) .NET Foundation. All rights reserved.
                                     Value="$(HttpActivityPropagationSupport)"
                                     Trim="true" />
 
+    <RuntimeHostConfigurationOption Include="System.Resources.ResourceManager.AllowCustomResourceTypes"
+                                    Condition="'$(CustomResourceTypesSupport)' != ''"
+                                    Value="$(CustomResourceTypesSupport)"
+                                    Trim="true" />
+
     <RuntimeHostConfigurationOption Include="System.Resources.UseSystemResourceKeys"
                                     Condition="'$(UseSystemResourceKeys)' != ''"
                                     Value="$(UseSystemResourceKeys)"
diff --git a/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAProjectWithAllFeatures.cs b/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAProjectWithAllFeatures.cs
index ce3b8cd90551..fa2de4db67c1 100644
--- a/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAProjectWithAllFeatures.cs
+++ b/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAProjectWithAllFeatures.cs
@@ -78,6 +78,7 @@ public void It_publishes_the_project_correctly(string targetFramework, string []
             ""System.Runtime.TieredCompilation.QuickJit"": true,
             ""System.Runtime.TieredCompilation.QuickJitForLoops"": true,
             ""System.StartupHookProvider.IsSupported"": false,
+            ""System.Resources.ResourceManager.AllowCustomResourceTypes"": false,
             ""System.Text.Encoding.EnableUnsafeUTF7Encoding"": false,
             ""System.Threading.ThreadPool.MinThreads"": 2,
             ""System.Threading.ThreadPool.MaxThreads"": 9,
diff --git a/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToRunILLink.cs b/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToRunILLink.cs
index 2e4af15cdd7e..7218176b63e3 100644
--- a/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToRunILLink.cs
+++ b/src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToRunILLink.cs
@@ -379,10 +379,14 @@ public void StartupHookSupport_is_false_by_default_on_trimmed_apps(string target
                 runtimeConfig["runtimeOptions"]["configProperties"]
                     ["System.StartupHookProvider.IsSupported"].Value<bool>()
                     .Should().Be(false);
+                runtimeConfig["runtimeOptions"]["configProperties"]
+                    ["System.Resources.ResourceManager.AllowCustomResourceTypes"].Value<bool>()
+                    .Should().Be(false);
             }
             else
             {
                 runtimeConfigContents.Should().NotContain("System.StartupHookProvider.IsSupported");
+                runtimeConfigContents.Should().NotContain("System.Resources.ResourceManager.AllowCustomResourceTypes");
             }
         }