Copy model specified material error

[anan1213095357]

version last
system win10

When I copied the model, everything was normal and smooth, but if I added new materials to the copied model, an error would occur.

[Kryptos-FR]

@anan1213095357 Thanks for coming here. GitHub Issues are meant to be used for actual bugs that are reproducible and likely a problem in the engine.

It looks like your problem is more about knowing on how to use the engine, in which case I would suggest to use the discussions panel or to join the discord community and ask your questions there, so that this GitHub Issues space doesn't get overwhelmed.

I will convert it into a discussion as well as #2442.