At the moment I use Catalina and GarageBand as the only DAW.
My Waves plugins show up only as stereo (s), regardless of track being mono or stereo, even if they are the only plugin for this track.
I just cannot see any mono versions on the list.
I reinstalled and reinitialise plugins per instructions by Waves tream - no change.
I just checked simple and free Audacity editor and mono plugins DO SHOW UP there
So they are installed, I just cannot get them to show in GarageBand.