Background animation is not resumed upon history jump

1. Load a page with an animated background
2. Navigate to another page
3. Go back by swiping
4. Observe that the previously animated background is now static

One can test the behavior here: https://steamcommunity.com/id/haarolean/
See the recording attached as well

expected it to resume

Version 0.99.126.4.1-beta

Monterey (12)