I have mentioned before about the game reported to be crashing on Steam Deck. It turns out that wearing a cape is a cause for crashes, pretty consistently. This does not appear to affect other platforms though.
Do make sure to report to Hello Games.
As a workaround on Steam Deck, you could use PC with the save to remove the cape, or use a Save Editor.
Update:
Not sure it actually fixes the cape crash on Steam Deck though, could be something else.