https://bugs.webkit.org/show_bug.cgi?id=221086 implements recovery but does not cover the case of a change in track settings.
<rdar://problem/73744819>
Created attachment 421810 [details] Patch
Created attachment 421923 [details] Patch for landing
commit-queue failed to commit attachment 421923 [details] to WebKit repository. To retry, please set cq+ flag again.
Committed r273732: <https://commits.webkit.org/r273732> All reviewed patches have been landed. Closing bug and clearing flags on attachment 421923 [details].