Pianoteq Pro 9 not recognized by Cantabile - solved, sort of

I've used Pianoteq with the host program Cantabile for a decade without problems but Pianoteq 9 VST 3 does not load.  Pianoteq 8 - both VST 2 and VST 3 still load fine in Cantabile.  Ableton Live loaded Pianoteq 9 VST 3 just fine.  I'm using the latest version, Cantabile 4.

So I noticed it works in Cantabile if I remove the folder structure and just put the x86 plugin in my VST 3 folder.  Then I tried using the folder structure again - Contents, Resources, and x86..., but I have to delete the folder named arm64ec-win, probably because that contains the plugin with the exact same name as the x86 version.  This doesn't seem to be a problem with Ableton Live, but it is with Cantabile.