WowAce

The Addon did not track Bergsilberweisling. The Addon will track Bergsilbersalbei, but this translation is wrong. It is called Bergsilberweisling -> https://de.classic.wowhead.com/item=13465/bergsilberweisling

/edit 

Echtsilberablagerung is also missing -> https://de.classic.wowhead.com/object=2047/echtsilberablagerung

For some reason the localisation in Classic is different. In Regular it is still Bergsilbersalbei -> https://de.wowhead.com/item=13465/bergsilbersalbei

and Echtsilbervorkommen -> https://de.wowhead.com/object=2047/echtsilbervorkommen

There are more examples where GatherMate stopped working for me because the localisation file changed to classic  although I play regular. If possible we need both translations or different localisation files for regular and classic

GatherMate2 for Classic is now at https://www.wowace.com/projects/gathermate2-classic