There is still a problem when trying to use the VST3s in FL Studio. Not sure if it is a Image Line (Fl Studio) or Steinberg-problem. I don’t have problems with any other plugins in FL Studio though, only with the Basic FX Suite VST3 plugins.
Edit: The strange thing is that the Morphing Channel Strip works! Only the guitar effects and Yamaha Rev-X are shown with a Error upon scanning. if this could help Steinberg to troubleshoot the issue.
The thread is here (not sure you can read it fully without login in…)
https://forum.image-line.com/viewtopic.php?t=160650