Cryptic 400 when trying to close as duplicate of a Wiki
With my new moderator powers, I tried testing closing a question as a duplicate. I was able to close In search of moderator powers as a duplicate of Formatting sandbox, which is in a different category, but before that I tried closing it as a duplicate of Basic Wiki reading guidance, which is not a question (it's a Wiki). This failed, but instead of giving a message with a reason, it just displayed a pop up red box notice with "400" and nothing else.
Is this a problem with the dev server or a general problem to be raised on real Meta?
1 answer
I don't think you can close a post as a duplicate of a different post type (like article or wiki), but I would hope for better messaging. If it's a configuration error on this server, I can't think where it would be (I just looked at close reasons and post types and didn't see anything that stood out as odd).

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