r278197 added the test http/tests/media/hls/hls-webvtt-seek-backwards.html and this test has been timing out since it was added. Possible cause: GPUProcess is not enabled by default on the GTK/WPE ports.
Updated expectations on r279545
GStreamer bug: https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/969
r279565
*** This bug has been marked as a duplicate of bug 182108 ***