Whenever I play on this map, there's spots where a bunch of black visual glitches begin popping up, and they seem to vary wildly in severity. The two biggest offenders are the dining room and kitchen, which seem to have the most spots where these glitches occur.

I don't know what started causing these to appear, but I haven't found a way to fix it. The closest solution I found was switching to the Chromium + 64-bit binaries build (the last one in the dropdown for selecting a beta build), but even then that's more of a band-aid fix as some visual glitches remain.