A persistent 'Game Not Ready' popup error occurs when players attempt to join a published world, preventing them from entering the game until the Meta Horizon app is fully closed and relaunched. This issue consistently affects multiple users throughout the day, impacting player retention. It appears to be a client-side state issue that requires an app restart to clear. The error is reported on Windows 11 (10.0.26200) 64-bit, with app version 265.0.0.8.271, on the release build channel, using the Desktop Editor.