diff --git a/test/dotnet.Tests/TelemetryTests/TelemetryFilterTest.cs b/test/dotnet.Tests/TelemetryTests/TelemetryFilterTest.cs
index 300f1f90e0e1..8e5f306888a9 100644
--- a/test/dotnet.Tests/TelemetryTests/TelemetryFilterTest.cs
+++ b/test/dotnet.Tests/TelemetryTests/TelemetryFilterTest.cs
@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.CommandLine;
+using Microsoft.DotNet.Cli.Commands;
 using Microsoft.DotNet.Cli.Telemetry;
 using Microsoft.DotNet.Cli.Utils;
 using Microsoft.DotNet.Utilities;
@@ -52,7 +54,21 @@ public void TopLevelCommandNameShouldBeSentToTelemetryWithGlobalJsonState()
     [Fact]
     public void SubLevelCommandNameShouldBeSentToTelemetry()
     {
-        var parseResult = Parser.Parse(["new", "console"]);
+        // Use a fresh DotNetCommandDefinition to avoid test pollution from
+        // other tests that may have dynamically added template names (e.g. "console")
+        // as subcommands to the static Parser.RootCommand's "new" command.
+        // See InstantiateCommand.ExecuteAsync which mutates the static parser tree.
+        var rootCommand = new DotNetCommandDefinition();
+        // Remove the built-in VersionOption that conflicts with the SDK's custom --version option.
+        // In production, Parser.NormalizeRootOptions handles this, but it's private.
+        for (int i = rootCommand.Options.Count - 1; i >= 0; i--)
+        {
+            if (rootCommand.Options[i] is VersionOption)
+            {
+                rootCommand.Options.RemoveAt(i);
+            }
+        }
+        var parseResult = rootCommand.Parse(["new", "console"], Parser.ParserConfiguration);
         TelemetryEventEntry.SendFiltered(parseResult);
         _fakeTelemetry
             .LogEntries.Should()