Based off of this thread
It was noted as fixed in 1.41.0.8992
(Tags) Tags with unicode characters could not be deleted (PM-2031)
But, it is not fixed in the latest build.
Also, with the thread you linked where it is a known issue, I unfortunately only found it after I made this post, but still that thread had not had any replies for nearly 2 months and thread autoclose at the 3 monthmark so I recently replied to that thread as well to keep it alive.
