https://streamable.com/o9jzqb

I don't exactly know how to word this, so I included a video.
Basically, it looks like it happens when you make a belt that turns away from the balancer if it's placed right next to it.

EDIT: After trying again some more, it looks like I can't use those two belt balancers specifically. I can't place a belt to output from them or even remove the one on the left or else the game crashes.

https://puu.sh/GUo6D/d5dec2e273.jpg

I managed to remove both balancers without the game crashing by placing a waterfill under them to destroy them and then just filling the spot with landfill.

I tried to replicate the crashes but they work fine now.

Here is the clip of what I was doing that led up to the belt balancers crashing:

https://streamable.com/n66zoj

Can you please provide the save, where this happens, so i can look deeper into it?

Save file:
https://drive.google.com/file/d/1Kh3DUdPLi5LPi-9hcuVOWgY3YhkWoL9p/view?usp=sharing

The belt balancers are at (-1275, 465), just north of the Rare Metals Patch.

Thank you, i will look into it as soon as i have time :)