Pausing queues up looping animations. Mirage purple wave animation covers screen when you unpause

This occurs to me all the time with Ritual Favor window. Occurred with something last league too. I've been noticing it for several leagues with several mechanics. Surely introduced with the pausing mechanic.

The rough outline is: pause the game in some way, animations queue up infinitely (invisibly), then when you unpause your screen is 100% covered with the backlog of queued animations. If you move away it clears up.

Here's an example inside a Mirage, triggered with both Ritual pause and ESC pause: