check.gst-devtools.validate.launcher_tests.test_validate.launch_pipeline.not_negotiated.caps_query_failure.play_15s
This test is fleaky, the modified element is not involved in this test. I suggest to blacklist it.
check.gst-devtools.validate.launcher_tests.test_validate.launch_pipeline.not_negotiated.caps_query_failure.play_15s