diff --git a/CompatIssue/Class1.cs b/CompatIssue/Class1.cs
new file mode 100644
index 00000000..7e6e5e37
--- /dev/null
+++ b/CompatIssue/Class1.cs
@@ -0,0 +1,12 @@
+namespace CompatIssue;
+
+public class Class1
+{
+    public void Method()
+    {
+    }
+    
+    public int Property => 10;
+    
+    public int? NullableProperty => 10;
+}
diff --git a/CompatIssue/CompatIssue.csproj b/CompatIssue/CompatIssue.csproj
new file mode 100644
index 00000000..4bbd7a07
--- /dev/null
+++ b/CompatIssue/CompatIssue.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <Version>1.2.0</Version>
+    <PackageValidationBaselineVersion>1.1.0</PackageValidationBaselineVersion>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>    
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+    <EnablePackageValidation>true</EnablePackageValidation>
+  </PropertyGroup>
+
+</Project>
diff --git a/CompatIssue/README.md b/CompatIssue/README.md
new file mode 100644
index 00000000..ad137f50
--- /dev/null
+++ b/CompatIssue/README.md
@@ -0,0 +1,2 @@
+This directory exists to demonstrate an issue with the MS compat tool.
+See https://github.com/dotnet/sdk/issues/39629 for details
\ No newline at end of file
diff --git a/CompatIssue/SampleEnum.cs b/CompatIssue/SampleEnum.cs
new file mode 100644
index 00000000..1d5de75e
--- /dev/null
+++ b/CompatIssue/SampleEnum.cs
@@ -0,0 +1,7 @@
+namespace CompatIssue;
+
+public enum SampleEnum
+{
+    Value0,
+    Value1
+}
diff --git a/CompatIssue/global.json b/CompatIssue/global.json
new file mode 100644
index 00000000..282c5a85
--- /dev/null
+++ b/CompatIssue/global.json
@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "8.0.203",
+    "rollForward": "latestFeature"
+  }
+}
\ No newline at end of file