I was browsing the suggested edits queue and ran across a suggestion that had no buttons. It's a wiki edit for a tag which appears to no longer exist.
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Well this is a bit annoying. I changed it so we automatically reject all the suggested edits on orphan wikis. There is no ideal way of acting here, but this will do as orphan wikis are quite rare.
These appear to be showing up with greater frequency. Could be coincidental - but just a few minutes ago I saw five at the top of the suggested edit queue: