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I recently encountered this question on MSO, where a user asks about why certain tags appear in the tag overview page.

This issue is caused by a synonym that redirects users to a non-existent tag.

I've created this SEDE query, and on Stack Overflow alone, a total of 60 approved synonyms exist that point to tags that don't exist. On other sites, I expect orphaned synonyms will exist too

These synonyms are still functional: they show up in the tag page, when searching for it you still get redirected, and if you try to use it in a new question, you will get a prompt if you want to create the synonym target (if you're >1.5K+ rep).

Could we destroy all synonyms too when destroying tags? Or add a separate cleanup script for synonyms?

Not sure if feature request or bug report, feel free to retag

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