I wanted to put error-message in one of the questions I edited. When I typed "error-" there is error-message in the suggestion box as expected, but there is also error-messages, which is a synonym to error-message (as one can see on the screenshot attached).
When I select error-messages and click "learn-more" it opens 36 questions tagged with it (I guess it was made a synonym to error-message but somehow questions were not retagged).
Now when I click about to open errors-messages tag wiki, it redirects me to https://stackoverflow.com/tags/error-message/info instead.
So what's going on there? Synonym [error-messages] -> [error-message] seems to work fine, but why is error-messages displayed in the suggestion box? It looks like a bug to me. Is it?