Experienced this today. Took me a while to figure out it wasn't intended, lol.
Arch Linux
Viewing post in [Bug] Toilet realm not rendering properly
The Windows version works great for me with Wine. Toilet realm renders properly. Running with a 32-bit Wine prefix. I already have some libraries installed in my prefix, so it might not work well in a fresh one. YMMV. But just letting people know that it's possible to run through Wine as a workaround.
If I click out the window, I can't do anything and have to close the game and reopen. Never lost my save doing this, so not a huge problem. This is likely a Wine bug, not the game's fault.