Empty fire groups were always removed, this isn't the case anymore.
View attachment 280596
But I'm still able to assign these empty groups:
View attachment 280597
So far this looks trivial to me. Or what else am I missing...
edit:
The only halfway plausible (very speculative) explanation why I seem to be an exception here is that all groups were already occupied before update 8 and after update 8 they were all deleted but still present, even if empty. Apparently this mechanism, which automatically removes empty groups and creates them as needed, has broken down. And all those who had only occupied 2 or 3 groups before update 8 can now only occupy these. Can anyone confirm this?
If this matters at all, then only for the developers I guess...