Overlay / annotations get misplaced occasionally

I've not got any further in providing steps to reproduce this, but it did happen to me just now and I was able to deduce that the issue is occuring in ui/src/features/layout/previewOverlay/ViewportOverlay.tsx. It seems that updateRect() is either not being called, or being called and failing to correctly update the rect.

I've raised an MR that I hope will be more reliable, but it's hard to be sure given I'm not sure the exact sequence of events that cause the issue.

I was able to reproduce the problem on the MR. Attached video

Updated issue summary with the steps i used to reproduce.

Replacing with audio-free video