See https://github.com/w3c/web-platform-tests/pull/4921 Renamed webvtt-api-for-browsers/vttcue-interface -> api/VTTCue Need to update test expectations accordingly.
I think due to test infrastructure changes required, the WebVTT upstream sync is on need to need basis. I think @Kohei is already tackling this, so marking this as "RESOLVED CONFIGURATION CHANGED".