Ok, so switching to Pop on Wayland works. I didn't mention this in my original post, but I've been running Pop on Cinnamon. So I either need to get comfortable with Pop's DE or figure out if this is a cinnamon issue.
Previously I had an issue with fullscreen games having weird lag issues on Wayland. Though... testing that out now, that seems to no longer be an issue.
After trying this for a few minutes, I really don't like how slow the dock shows itself when I hover near the bottom of the screen, and i don't like how the application bar adds visual noise to the top of the screen. To me, it makes more sense for the two bars to be united as one like in cinnamon. :/
Out of curiosity, I wonder if the crash occurs when I'm in Pop x11, or if this is a cinnamon-specific bug.
EDIT: The crash occurs on Pop's default DE on X11, and cinnamon on X11, but not Pop on Wayland.
I never used cinnamon, but on what you're saying, it might be that the version (popos ships) cinnamon is at doesn't support nvidia on wayland, without bugs. I might be saying crap.
But on gnome (what i think is pop default DE) wayland works fine on 560, so yeah, very difficult situation.