When I open the creative inventory (version 1.18.2 Forge 40.2.1) on vanilla servers, my client crashes. (The inventory opens successfully without this mod.)

If I had to guess it's because this mod is client and server side so I don't think the scenario of client side only will be supported.

Understood, ty for reply, still if u can not fully support client only, just "not the crash" thing please let me know somehow)
Ty again.

This actually is an issue. So I'm gonna reopen this.