I have a 1.16.5 server running 30 or so mods, and it's been running smoothly for about a month now. The past few days however, it can't seem to go more than 30 minutes without hanging and crashing due to the watchdog killing the server. It seems to be happening while players are exploring Twilight Forest, but I'm not sure what would be causing it. I already tried setting the server tickrate to -1, that didn't help.
Here's a pastebin of a crash log from today: https://pastebin.com/mvx3G98f