Memory leaks in practice screen

Something in the practice system/practice UI leaks memory. We have quite a few RID allocations that get lost there and logged on exit. This task is a tracker just to investigate and clear those. They're pretty harmless as upon closing the app, everything gets cleared up and it's not like leaks every frame so it's a small amount of memory, perhaps around practice resources, but we should still address it sometime.

No file, test, or specific entry point is named. Start by reproducing the practice screen workflow and checking the RID allocations logged on exit, then trace them through the practice system and UI. Done means the reported allocations are released without introducing new leaks.

Written by the indexing model from the issue text.