Mods:
- Big_Brother 0.54
- Repair_Turret 1.0.1
- Teleporters 1.0.5
- base 1.1.27
- Factoryplanner 1.1.19
- flib 0.7.0
- minable-intermediates 2021.2.7
About 5-10 seconds before the crash I copy-pasted few (two I think) repair turrets and big power poles around the ghost belts near {-240,-500}, so that the repair turrets could finish building them, and then watched while the belts were built.
There was a pause as if the game was autosaving, but it took much longer and then crashed (the auto save progress bar did not show up, the game just froze like an auto save).
I tried to reproduce the bug from latest autosave, but I couldn't remember where I placed the turrets so I wasn't able to perfectly reproduce the sequence of events and the game did not crash. Hopefully it's a one of error, but I thought you should at least have a look.
Thanks.