Minecraft Version

1.20.1

Mod Loader and Version

Forge-47.2.0

Ad Astra! Version

1.15.16

Addon Mod Version (This Mod)

6.4

The details

my guess here is that your code tries to put space breathing unit into any meka-related thing except for meka-tool (for shorter code)
and meka-weapon is not for breathing in space.
that's just my guess, I sent the crash log when you needed it.

Try update Mekanism: Weapons omeranha/MekaWeapons#10

I can't reproduce.
Send me crash report.

darn it

Is it ok if remove mekanism: weapons?
I need crash report.