[Bugfix] Reset `subtreeFlags` in `resetWorkInProgress`#20948

Merged

acdlite merged 2 commits intofacebook:masterfrom

acdlite:suspenselist-bugfix

Mar 7, 2021

Commits on Mar 5, 2021

Add failing regression test

acdlite
and
gaearon
committed

Commits on Mar 7, 2021

Reset `subtreeFlags` in `resetWorkInProgress`
acdlite
committed