This is a regression from https://trac.webkit.org/changeset/251808/webkit.
<rdar://problem/56798620>
Created attachment 382526 [details] Patch
Comment on attachment 382526 [details] Patch Clearing flags on attachment: 382526 Committed r251901: <https://trac.webkit.org/changeset/251901>
All reviewed patches have been landed. Closing bug.