No, all links are working here, e.x.
https://meta.discourse.org/tag/official/. All links from tags have a correct root.
I updated my test server to 2.7.0.beta1 ( d8b015e3be ) and still get this error.
This happens everywhere - when I click the tag in any post or do it on the Tags page.
I think, that this FAQ should be changed because Tags core url was changed.
Does anybody have an idea of how to fix my problem - change /tags/ to /tag/ in all urls?
The problem was found in the plugin.
To make troubleshooting easier in the future, I’d try safe mode to eliminate the source of the issue.