Why did the recent maintenance notices point to a search for [maintenance] or [maintenance]? [duplicate]

If you copy the link before clicking on it, you'll see it's actually a tag search for the tags maintenance and site-maintenance:

https://meta.stackexchange.com/questions/tagged/maintenance+or+site-maintenance?tab=Newest

However, since October 30, 2021, site-maintenance has been a synonym of maintenance:

The banner link has apparently not been updated since the creation of the synonym, and needs to now be updated.

There should also be a couple additional changes to tag searching that should make this situation clearer:

1. Resolve duplicate tags and remove them from the search, so old links to a multi-tag search where one of them has been synonymized to another will only search for the one master tag.
2. If in a tag search the user searches for a synonym tag, add a notice that the tag has been swapped as it's a synonym, rather than just having it unexpectedly change.