When crafting a plasma core which is a recipe that requires multiple items for certain slots of the recipe, my game instantly crashes.

Can you please post a crashlog and the minceraft and ic2classic version you are using? Without that we can't do anything about this

Thought you was gonna ask this. Apologies. Version is 2.2.999
https://mclo.gs/cezLmQ5

@ShiftyMLG thank you.
Did you try that with Just IC2Classic or with a modpack?
Can you confirm this is a IC2 Classic bug or a Modpack bug?

It was with tekkit 2. How can I find out if it’s modpack related or not?

@ShiftyMLG no worry xD
@xJon your turn please.

@xJon thank you :)
So not IC2Cs bug.

@Speiger Yes, this is actually the same issue as #772 (which is already resolved in development). I'm hoping to release a new Tekkit 2 update in the coming weeks.