MediaBay Presets

I have installed Absolute3 package with GrooveAgent 4, Halion 6 etc. and Cubase 9.5, newst build.
In MediaBay, however, only Padshop and Retrologe appear. I rescanned my only harddrive several times, waited until all the red folder items disappeared, but still only the above 2, plus view manually generated ones.
What do I wrong?
Thanks for answering.

Addon: windows 10 and I rescanned the entire harddisk…
and the mediabay showing withing the plugin works as expected. Also, when selecting load preset. But in the mediaBay (F5), it is not listed. Why?

ok, I found something out: if I remove the file:
C:\Users\NAME\AppData\Roaming\Steinberg\Cubase 9.5_64\Default.xml
and restart Cubase: all the instruments, I expect, are there (again).
Then, I do a rescan of the hardrive C in MediaBay (right clicking on C: → rescan), the Halion etc. presets disappear and only retrologue, padshop and my own ones from external plugins stay. If you ask me, this is a bug of Cubase 9.5.30.

Ah, ok… I found it out: the focus in the file browser has to be on all media. For me it was clear, that all media and Harddrive C: is equal. But it is not in the mediabay browser world.