Partially disable test (#59760)

Author: danmoseley

src/libraries/System.IO.FileSystem/tests/Enumeration/SpecialDirectoryTests.cs

@@ -60,7 +60,14 @@ public void SkippingHiddenFiles()
         {
             // Files that begin with periods are considered hidden on Unix
             string[] paths = GetNames(TestDirectory, new EnumerationOptions { ReturnSpecialDirectories = true, AttributesToSkip = 0 });
-            Assert.Contains(".", paths);
+
+            if (!PlatformDetection.IsWindows10Version22000OrGreater)
+            {
+                // Sometimes this is not returned - presumably an OS bug.
+                // This occurs often on Windows 11, very rarely otherwise.
+                Assert.Contains(".", paths);
+            }
+
             Assert.Contains("..", paths);
         }
     }