How to fix Logic Pro plug-ins that validate but don’t show in the menu?

Hi! I bought a new MacBook Pro last November. I have been trying to open my plug-ins on Logic but fail to do so. I tried re-installing Logic and the plug-ins. I tried removing Rosetta and still got nothing. All my plug-ins are visible in the plug-in manager and are successfully validated, but do most do not show up when searching for the plug-ins whilst using Logic via the plug-in menu. I am mostly having issues with UAD and Sonnox plug-ins and I tried to contact them and nothing was resolved although they tried to help. This is my last resort. Thank you!

[Re-Titled by Moderator]

Original Title: Logic Pro - Third Party Plug-ins not working