Cubase 12 VST3 Plugins (all 3rd party) not showing up

I also had an error that VST3 could not be read by a third party.
I just solved it

C:\Program Files\Common Files\VST3
After moving the entire VST3 folder to another location, run Cubase and quit.
Then, move the VST3 folder back to the original location and run Cubase.

I wish you success.