Update: the self-targeting item crash bug happens during every fight. Attempts to use an item will result in the situation on the screenshot above. The only option is to quit the game. Tried clean reinstall (delete game, delete all files, reboot phone, install anew) - it's still there with a fresh save (chose NOT to import at the start). Haven't tried imported saves. Android version 11 (MI global 12-smth), game version 5.4.1.
UPDATE 2: Same problem if importing saves