We’re aware of an issue with the PlayStation 5 and Xbox Series X|S versions of Monster Hunter Stories 3: Twisted Reflection, that can occur if you start playing the game while it’s still downloading but the system has told you it’s ready to play.
If you do this, a malfunction may occur when reaching a certain point in the game if you keep playing after the download has completed.
To avoid this issue, please save and quit to the title screen at least once after the download has completed. You may then safely resume gameplay. We plan to release a hotfix for this issue in the near future.