Metahuman is not working on 5.6 with macOS?

I used MetaHuman Character on PC, created my metahuman, generated the Cine version. So now it is out of the MH Creator and it’s own BP as expected. But if I open the project in a Mac environment, the MetaHuman Character is gone (as expected), but the metahuman BP that was generated is now not working. I thought it would work on Mac like any other MetaHuman. The BP was unmodified. Any ideas?