So I tried to manage tag groups and found that there is no titles of the tag groups I have.
I can edit the tag group if I click any line, except the title (it is empty).
I activated safe-mode and nothing changed. My Discourse version is 2.7.0.beta1 ( 4f72830eb0 )
Then I checked my test server. There is no such problem. It’s version is 2.7.0.beta1 ( 9da9b2e1cc )
What may cause the problem?