Upon trying to improve a suggested tag wiki edit (no tag wiki had previously existed for that tag) here on MSO, I was brought to a 404.
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I just experienced a bug with the same visible behavior on U&L: I improved a suggested edit to a tag wiki body which was creating the tag wiki, the suggested edit was approved while I was editing, and I was brought to a 404 page when I submitted my edit. This may or may not be the same bug given there have been changes around this part of the code. I have 20k on U&L.