For now a tag’s links become broken after the tag has been renamed.
If a tag has been renamed, then the tagging plugin should redirect the visitors of an old tag page to the new one (similar to the renamed topic pages)
dmitry_fedyuk (Discourse.PRO) #1
codinghorror (Jeff Atwood) #2
Unlikely – we don’t do this for categories.
And you can manually add a link that will redirect if it’s so important. That’s possible in Admin section already.