Hi!
I'm on Reaper x64 6.75 / Windows 10 x64.
EDIT: Figured it out!
All my CLAPs have custom names. Custom names work fine for VST but not for CLAP (reaper-clap-rename-*.ini)
Removing the custom name lets me add CLAPs just fine!
This is really helpful, Thanks! I’ll see if I can do something about it