2.8.0.beta7 ( 0f03884375 ) ( later than FIX: Allow staff to view pending/expired invites of other users by davidtaylorhq · Pull Request #14602 · discourse/discourse · GitHub )
Staff doesn’t seem to be able to save a modified invite of another non-staff user (with for instance a Max uses changed from 1 to 10, within the parameter limit)
invalid_params is displayed : You supplied invalid parameters to the request: id