lost save on Borderlands 3

Hi all, I'm hoping someone can help me. I'm a bit of a noob when it comes to Linux and so a bit out of my depth.

I started Borderlands 3 yesterday and played about 45 mins. I then exited to desktop. When I rebooted I decided to choose a more recent version of proton and my save is no longer there. I've tried going back to the original proton and it doesn't load the same there either. I've looked for the .sav file on my steam deck and I can't find it, the save folder for Borderlands 3 is empty. I've also got a folder called 'corrupted pfx'.

What's happened and can I get my save back?
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