Youtube going to fullscreen skips bug

Whenever I switch between fullscreen and back in this video for example – youtube skips 2 seconds forward in time. Even while paused.

I found two relevant issues:

The first one suggests to disable flash’s hardware acceleration which does work (right click the video and then click settings).

But why should we do that?

Also did I mention I dislike losing all the video I buffered in 360p when youtube auto-switches to 480p with fullscreen? I had to manually disable that too.