Upon random messing around on Stack Overflow I found this suggested edit which says:
This item is no longer reviewable
What caused this?
My own assumptions are:
The suggested edit did not get reviews in X hours thus "expired" and is now a zombie. Not likely though, as similar feature request I posted myself once was pretty much ignored.
Looking in the target post's revisions list I saw it got rolled back to a previous revision four minutes after the edit was suggested. Common sense says that when the post on which the edit was suggested is rolled back (and thus changed) that suggestion is now obsolete.
Deciding to check my second assumption, I searched Meta for more info just to find this other suggested edit that was victim of a Rollback (Original post mentioning this) so it looks like that's still not the reason, unless it was a bug that got fixed in the meanwhile and instead of showing empty "rejected" it now shows the above message. (In such a case I would expect a dev to explain in the bug report, but there is nothing like that)
I checked couple more things:
- If the target post get deleted, the suggested edit dies and results in a "Page Not Found" errror. (Happened to me just now by chance)
- If I view suggested edit that I already reviewed before and is still active, it correctly shows:
You have already reviewed this item. It needs more reviews from other users to be completed