We have parts of application flickering with blur present when tested on main. Though it's possible that the blur causes the issue indirectly by making the rasterisation taking longer.

Bistected down to flutter/engine@8e6497f.
When reenabling the wait for command buffer the issue resolves.

The commit also causes another problem - when application goes to background while scrolling it crashes with

-[MTLDebugCommandBuffer dealloc]:136: failed assertion `MTLCommandBuffer is in an invalid status when being destroyed; is it being over-released?'

This doesn't happens when waiting until the command buffer gets schedule. cc @jonahwilliams

Originally posted by @knopp in #127173 (comment)