Not long ago I was working on a script that used the G'MIC plasma feature. After upgrading to a newer G'MIC it was gone. It took me a while of searching before I figured out what was going on.

On the official G'MIC web-site a forum post discussed the fact that some works were being 'moved to new locations'. This prompted me to look through G'MIC more thoroughly. I eventually found plasma again, but it was in a new spot. It is entirely possible that the contents of 'Enhancements' has been split up and placed in sections which refer to WHAT they effect directly, rather than a catch all category.

I would suggest looking for the specific enhancement you are seeking in the various other categories.

Check out this link for gmic details


http://gmic.eu/gimp_filters.txt

it lists filters by category on top, and by name at bottom.

for example a former resident of Enhancements Smooth Bilateral now shows it's in repair
Smooth [bilateral] (in '/Repair/')

There is now a filter search capability in GMIC - you will find it under the 'About' label in the filter tree. There is a list of all included filters as well.

Have you tried the Categories 'Details' and 'Repair'