Switch Volcano dungeon glitching for P2

Camo64

Newcomer
My brother and I have a sdv save on switch that we have been playing for 6 in-game years. When 1.6 came to switch, the volcano dungeon started generating glitched floors for my brother (P2) (straw hat), but not for me (P1) (totem mask).
When I load a floor, it loads normally (pic 1 and 3), but when he loads a floor, it bugs out (pic 2).
When my brother leaves a bugged floor and then re-enters it after I have, it loads normally (pic 4)
If anyone knows why or how to fix this, I would greatly like to know.
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