There are 180 of these:
enum_without_group.txt
P.S. This might become outdated again, here is an auto-updating version.
(I only counted parameters with GLenum or GLbitfield type)
I'm not entirely sure if it's worth fixing, with its scale. Because it can't really be fully automated, someone needs to check every function individually.
But I guess it should be at least documented, that you can't rely on the group attribute being there...