Steps To Reproduce:
1. Go to news.ycombinator.com
2. Click a link to some external site
3. Hit back
4. Click the same link again
Sometime you get black or white flash (depending on dark mode setting). Fast loading sites seem more likely to show it.
Created attachment 360457 [details]
Comment on attachment 360457 [details]
Clearing flags on attachment: 360457
Committed r240663: <https://trac.webkit.org/changeset/240663>
All reviewed patches have been landed. Closing bug.