Assert when overlapping keys are removed. This is due to drawing count mismatch, more specifically when drawing is not removed/overwritten but early check validation caused it. Remove `validate_drawing_user_counts` from `remove_drawings_with_no_users`. If Drawing is actually removed (`drawings_to_remove` non empty), validation function will be called at the end. Pull Request: https://projects.blender.org/blender/blender/pulls/143057