There seems to be a bug with the factory scanning of Komplete Kontrol 3+.  I have the latest versions of u-he, Plogue, and Synapse Audio 3rd party plugins installed (VST3 and NKS presets included) on my desktop (windows 10) and laptop (windows 11).  I have the latest version of Komplete Kontrol installed on both also.
Prior to today, I had Komplete Kontrol 2 installed, and it saw ALL of my 3rd party plugins.  I updated to Komplete Kontrol 3, and the results of the factory scan varied GREATLY between both computers.
In Kontrol 3, my Desktop found all of my u-he, Plogue, and Synapse file locations and stored them as factory file locations.  However, it only displays Synapse Audio presets in the browser.
Kontrol 3 on my laptop found only the Plogue file locations, not the u-he or Synapse.  It only displayed Plogue presets.  When I click Rescan on factory locations, it blips for a second and acts like it did nothing.
Both installation settings are identical.  There appears to be a major bug inscanning 3rd party NKS with Komplete Kontrol 3.