This is where Apple comes into play, helping you and us to understand why successfully validated plugins won’t be listed in Logic.
Just to make it clear, we at Steinberg can’t do anything in this matter. You have to ask Apple about the progress. This issue is affecting other plugin vendors (e.g. Waves, Focusrite, Spectrasonics) as well.
This is something I found on https://www.logicprohelp.com. No responsibility taken, though!
None of my Waves plugins were showing after validation, in addition to several other workhorse plugins. This was scary, but it worked for me:
Everything is currently appearing and will hopefully stay that way…