Bismuth is a strong diamagnet, and it can enter a superconducting state (at a fraction of a degree above zero), so it's not impossible. (And lots of materials a

Bismuth is a strong diamagnet, and it can enter a superconducting state (at a fraction of a degree above zero), so it's not impossible. (And lots of materials are weak diamagnets and superconduct at some point.) So it wouldn't be unheard of. That said, LK-99 would definitely be an object of lots of research if it does have those properties.