Game crashes when achievement is shown

Your system information

In short: Steam Beta running on Fedora 31, using Flatpak. X11 and proprietary NVidia drivers.

• Flatpak System Information.txt
• Inxi System Information.txt
• Steam System Information.txt

Please describe your issue in as much detail as possible:

I was playing Prey 2017 (app/480490) using Proton 5.0.4 While playing, there were 2 earlier crashes but I kept playing. After the third crash, I noticed a patern: Whenever I got an achievement (and associated popup), it crashed monements later.

At the time of writing, I had three crashes, related to the three achievements I have right now:

• Use first plasmind: Know Thy Self
• Use recycle grenede effectively: Reduce, Reuse, Recycle
• Discover NPC's hidden stash: Coffee Break

Steps for reproducing this issue:

1. The easiest achievement would be 'Know Thy Self'
2. Ensure you don't have the achievement already
3. Start the game using Proton 5.0.4
4. Run through the intro and get the plasmind and jam it in your eye

Start by reproducing the crash with Prey 2017 using Proton 5.0.4, following the listed steps and the stated Fedora, Flatpak, X11, and proprietary NVIDIA setup. Review the attached Flatpak, Inxi, and Steam system information while checking what happens when the achievement popup appears; done means the achievement can be shown without the game crashing.