https://gist.github.com/TeetoKaziim/cc2937c159f7b70276ba8243ed7f5236

Forge: 14.23.5.2808
Modular Diversity: 1.1
Mystical Mechanics: 0.5
231 other mods listed in the crash report.

Reproduction Steps:
Place a Mechanical Input Hatch.
Place an Axle Adjacent to it.

Reloading the world, you can actually get in game, but you can get yourself a slightly newer, and mildly different crash by placing a creative mechanical power source next to that axle, in a bold attempt to power the hatch:

https://gist.github.com/TeetoKaziim/ab2e1324db427018f68c7e38da48323f

Actually that mostly looks the same.

But THEN: After crashing twice, you can load the world up again, and admire your handiwork:

Breaking the creative power output causes yet another of the same crash:

https://gist.github.com/TeetoKaziim/5bfd6db4dc85d1fcd624551dc6a7b7e0

As I suspect any change to the power output level would. But setting up a variable mechanical power output setup in my world would take about 3 more crashes and reloads.