QPainter fails in 5120x1440 resolution

I recently bought the new Samsung 49" ultrawide monitor that has a resolution of 5120x1440 and since then I have some trouble getting certain Qt-based programs to start.
If I decrease the resolution to 3840x1080 they start just fine and if I then swap back to the native resolution of 5120x1440 they work fine as long as I don't close them.
If I try to run either program from a terminal I get output about QPainter not being active and eventually it seg faults.

The programs I've noticed I have problems with is VLC (3.0.8) and KeepassXC (2.4.3). There might be other Qt-based programs that run fine but I haven't investigated other programs I use that run fine to figure out if they use Qt or not.

As for OS, I'm running Manjaro with i3, all fully updated.