How do you fix Lego Harry Potter Years 1-4 dada room glitch?

To fix the DADA room glitch in LEGO Harry Potter Years 1-4, try clearing the cache of your game or restarting the console/PC. If that doesn't work, check for any available game updates or patches that may address this issue. Additionally, you can attempt to load a previous save or replay the level to see if the glitch resolves itself. If the problem persists, consult the game's support forums for specific troubleshooting tips related to your platform.