Add reference to issue we intend to fix

Author: timfel

graalpython/com.oracle.graal.python.test.integration/src/org/graalvm/python/embedding/test/integration/VirtualFileSystemIntegrationTest.java

@@ -270,7 +270,7 @@ public void fsOperations(Context ctx, String pathPrefix) {
         eval(ctx, "import os; assert os.path.exists('{pathPrefix}emptydir')", pathPrefix);
         eval(ctx, "import os; assert os.path.exists('{pathPrefix}emptydir/')", pathPrefix);
         eval(ctx, "import os; assert os.path.exists('{pathPrefix}dir1/file2')", pathPrefix);
-        Assume.assumeFalse("FileNotFoundException is not translated properly to isolate and then the Python code gets a generic I/O error", Boolean.getBoolean("polyglot.engine.SpawnIsolate"));
+        Assume.assumeFalse("[GR-66484] FileNotFoundException is not translated properly to isolate and then the Python code gets a generic I/O error", Boolean.getBoolean("polyglot.engine.SpawnIsolate"));
         eval(ctx, "import os; assert not os.path.exists('{pathPrefix}doesnotexist')", pathPrefix);
         eval(ctx, "import os; assert not os.path.exists('{pathPrefix}doesnotexist/')", pathPrefix);