algan.errors.HierarchyChangedDuringUpdaterWarning

exception HierarchyChangedDuringUpdaterWarning

Warns that a hierarchy change reaches back over a live updater’s frames.

A recorded animation resolves which Mobs it covers once, when it is recorded. An updater does not: it is re-run for every frame it covers, and re-resolves its subtree against the hierarchy as it stands when the frames are rendered. So attaching or detaching a Mob inside a subtree a live updater drives changes the frames that updater already covered, including frames before the line that made the change.