I first thought that this was a problem with immersive portals (because of how it was layed out, it looked like immersive portals was part of the stacktrace. I've also submitted this there just in case) but it's happened twice now and I noticed in both crash reports, the block entity being ticked was a monster box. It crashes shortly after I load into the world. Both of the crash reports are the same except for timestamps and such so I'll only submit the latter.

crash report

Appears to be a crash with worldgen. The fact monster boxes are being ticked seems arbitrary here. Not sure what's going on, but it's very unlikely it's quark.

Yeah, I removed it and it didn’t fix it.