Things ain't going to work so well if this happens. It should be a hard session error.
<rdar://problem/40424020>
Created attachment 340877 [details] Patch
Comment on attachment 340877 [details] Patch Clearing flags on attachment: 340877 Committed r232028: <https://trac.webkit.org/changeset/232028>
All reviewed patches have been landed. Closing bug.