Maximize/unmaximize windows animation breaks in Epiphany when a website is loaded

[dmatavel]

first, congratulations to everyone for the release of elementary OS 6, a great advance and an amazing job.

i am opening this issue because i didn't find it among the ones already open, if i am wrong, please notify me.

what happened?

when maximizing or unmaximize the Epiphany window with a loaded site, it crashes, displaying a non-standard behavior. The window splits in two pieces.

this does not happen when a site is not loaded, and as far as I was able to test, it doesn't happen with the other standard system apps.

Peek.10-08-2021.17-45.mp4

how to reproduce?

1. open Epiphany
2. load a site
3. maximize/unmaximize the Epiphany window

System and Hardwere info

Posted in Browser repo as elementary/browser#38 (comment)