only after battling the lady that appears on the other side
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Alright, I still can't replicate this bug, but I added an option to the debugger called "Dungeon 6 Stuck in Barrier" to patch 0.51.6 in the download folder, which you can use to get unstuck, if you still are on the bugged save file. If this is happening every time you try and get through the barrier, I'd try the patch anyways to see if it's a bug I fixed already, but if not let me know, thanks.