Game steals mouse during loading

[Celarious]

After selecting an avatar and loading into the universe, while the universe loads with the limbo animation, the game yoinks control of the mouse, regardless of what window or monitor it's on, and repeatedly re-steals it making it impossible to move the mouse around until the scene has fully loaded. This is extremely noticeable on long loading saves. It's fine after the scene loads in, where the game properly releases control