It seems to specifically be copying or cutting anything that does not use the thermal system, oddly enough!

copying furnaces works, but not inserters or belts. Specifically, if they are included it will crash (so copying only works if you exclusively copy thermal things)

Notably, this happens on both the platforms and on arrival, and only effects copying, if you convert it into a blueprint first, it's fine

This should be fixed now.

Yup, can confirm, it's good now, thanks a ton for fixing it so quickly ^v^