diff --git a/src/xunit.runner.visualstudio/VsTestRunner.cs b/src/xunit.runner.visualstudio/VsTestRunner.cs
index cb0a82d..0e90c05 100644
--- a/src/xunit.runner.visualstudio/VsTestRunner.cs
+++ b/src/xunit.runner.visualstudio/VsTestRunner.cs
@@ -489,6 +489,10 @@ async Task RunTestsInAssembly(
 				if (assemblyFileName is null)
 					return;
 
+				// Pre-enumerate theories by default, so that we can see all traits, including those that come from
+				// ITheoryDataRow in v3. See: https://github.com/xunit/visualstudio.xunit/issues/426
+				runInfo.Assembly.Configuration.PreEnumerateTheories ??= true;
+
 				var configuration = runInfo.Assembly.Configuration;
 
 				using var _ = AssemblyHelper.SubscribeResolveForAssembly(assemblyFileName, new DiagnosticMessageSink(logger, showDiagnostics: configuration.DiagnosticMessagesOrDefault, showInternalDiagnostics: configuration.DiagnosticMessagesOrDefault));