media/controls/forced-tracks-only.html Test is a flaky timeout according to history on macOS Catalina wk2 Debug. First occurrence of a timeout is at r259319 but no indication that revision was cause as it was a change to expectations. History: https://results.webkit.org/?suite=layout-tests&test=media%2Fcontrols%2Fforced-tracks-only.html&limit=50000&platform=mac&version_name=Catalina&style=debug&flavor=wk2 Diff: Timeout
<rdar://problem/67738721>
Test expectation while investigated: https://trac.webkit.org/changeset/266113/webkit
WebKit QA confirmed this is resolved