Navigating quickly back and forth can lead to getting 'about:blank' in the backforward list when PSON is enabled.
<rdar://problem/47884404>
Created attachment 362144 [details] Patch
Comment on attachment 362144 [details] Patch Clearing flags on attachment: 362144 Committed r241606: <https://trac.webkit.org/changeset/241606>
All reviewed patches have been landed. Closing bug.