if a tag name is renamed redirect the old tag slug to new: flarum/tags flarum/framework#3497
old - https://discuss.flarum.org/t/test-post
new - https://discuss.flarum.org/t/sandbox
Just an idea. This could be done via redirection extension. Like in WordPress land there is Redirection addon that I've used to do some redirects when renaming pages etc.
MarkoK i miss that plugin Hari