I just reviewed a suggested edit:
My first reaction was: what invisible edit was made to the text ( e.g. insert
<BR>) to get this minimal edit in the queue. Then I noticed I had seen that gravatar before, that the editor has 17K6 reputation and that the proposed change was made in 2013 (when the editor had less then 2K rep.)
I briefly suspected that we now have review audits on U&L, but accepting the proposed change did not give any feedback to that effect.
There were no more edits than the change to the title. Nowadays you need to make larger changes for the system to accept them (at least on sites where I recently started with a low rep). When was the restriction of making larger minimal changes introduced?
Was this delay a result of a bug in the software? Or from some edge case in the database? If so what triggered this to show up in the review queue?
Was it an accident that this showed up, or are there more of these cases and are they being fed into the system at a low rate?
If this behaviour cannot be explained and/or is not intentional, I would consider it a bug.
For those wondering about it: the editor did get his +2 rep for an accepted edit. I hope it was worth the wait.