If I were to hazard a guess, I would say it’s a problem with having Mesh Components sharing a mesh asset.
A workaround may be to instance the mesh, but I don’t see any good way of doing that. I’ve tried simply duplicating the asset in the content browser, but that hasn’t fixed it.
From looking around, this seems to be a problem that people a lot of people have had (also known as the “component shows as ‘none’” problem) and even if there is some solution, something should probably be changed.