Just encountered two major bugs while playing as Rivulet. I had already completed the campaign and gotten seven passages, and I was playing with some mods (most notably InfiniteSpears).
So in regular Rivulet fashion, I decided to attack a Pink Lizard in Industrial Complex, in room HI_C02. However, even after putting four Spears into it, it did not die. So I kept putting more spears into it and stabbing it a bunch, but it STILL wouldn't die. For a minute or so, there were lagspikes whenever I tried attacking the lizard, but those went away not long afterwards.
After transporting some Eggbug eggs into the shelter above the karma flower, I decided to sleep to see what would happen...and the result was an incredibly broken and super laggy hibernation screen. I posted some screenshots in another server, and it got worse every time I Alt+Tabbed out of the game to talk to the server. I ended up having to use Alt+F4 because I couldn't get the cursor to appear.
Attached are some screenshots of the zombie pink lizard, the broken hibernation screen on first appearance and before using Alt+F4, and the console and exception logs. I think the intense lag on the hibernation screen was from the game spawning a ridiculous amount of graphics.