How do suggested edits work?
Earlier today, I was doing some reviews and saw a question for which someone had suggested adding a tag. The new tag however was incorrect and did not apply to the question, so I rejected the edit (adding an explanation to that effect).
Later on, I found another tag that was more appropriate and would have narrowed the question’s field. I tried to add it, but could not because the question was marked as
edit (1) and clicking it gave a message about there being a pending edit.
I figure this was because someone else had already accepted the aforementioned edit’s incorrect new tag, thus causing a conflict.
I checked back a couple of hours later and found that there were no longer any pending edits (the incorrect tag had been rejected by a mod), and in fact, it was even closed. I was now able to add the correct tag.
This was at best inconvenient and had I been busier, I would probably not have (even remembered to) return later on to improve the question.