I feel your pain and tested it also. Indeed, I get a C13 crash immediatly, as soon as I try to add Emulator X3 to a project, either via a an instrument track or as a rack instrument : it wasn’t the case with C12. And this, though it is still NOT appearing in the Studio > VST Plug-in Manager > Blocklist panel.
I don’t give up, though, as this needs more tests to see what could be the the setting that prevents it from working as expected. I’ll post here any progress that I could get on the subject.