This issue like issue reporter in MCD-5366.

Minecraft Dungeons in XBox (Game Pass) starts and screen reads Press any button to enter, a small white box appears at the top. That message disappears when a controller button is pressed but the game does not load. Music is playing. It seems the saved game (Gamer Tag KING Cezzy) will not load for some reason.

*If we add a guest account in Minecraft Dungeons the game loads successfully with no problem for the guest Gamer Tag. When we switch back to the main Gamer Tag loading the game remains stuck.

What we have tried for fix: Uninstalling and reinstalling Minecraft Dungeons. Hard restarts. Unplugging XBox. This does not fix the issue.