Doesn't seem to work. I have added a couple of additional groups, however only admins are able to mention groups. When users in the group @ and begin typing the group only users appear and no groups.
Also, this is more of a feature request and probably complex but it would be nice if permissions could be more granular to allow mentioning specific groups. I have some use cases where I don't want certain groups to be able to mention other groups, and want to assign which groups they should be able to mention.
admin: mention any group
group A: can mention group A, B, C
group B: can mention group B, C
group C: can mention group C
