Creating an Arch-Nemesis for the second time crashes the entire game

I created an Archnemesis using a currency reward and defeated it. I wanted to create a second archnemesis (can't remember what I used, I just picked a random one out of my stash) and confirmed it, but half a second later the instance crashed during the monster spawn.

I restarted the game and wanted to try again. However, since the archnemesis I created was created near the waypoint, using the waypoint crashes the game over and over if I enter the instance.

I managed to enter the instance by walking from another instance and using regular entrance. I made a bug report. Here's the screenshot:



Walking over to the archnemesis enemy crashed the game again. So it 100% is related to it.

Beforehand, as I went through Act 1 and beginning of Act 2, I have created multiple Archnemesis encounters without any issue, so this must be caused by the particular combination of mods or something.

DirectX11, by the way. Haven't tried Vulkan before the instance ran out of time and disappeared.

The same thing happened to me.
Created an Archnemesis (not sure which mod), killed it without any problems.
When creating the second one (no sure which mod) I instantly crashed. Went back to kill it and crashed again.
Tried a few more times and asked a friend to test and he also crashes instantly every time he gets close.