Subscription does not work for tags that are added later
A bug has been reported where the subscription function does not trigger notifications when a tag is added to a thread after its creation. Daniel_Mueller initially reported this issue, and gerhard confirmed it. However, after further testing, it appears that the issue may not be reproducible. tshenry was unable to replicate the bug, and adding a tag to an existing topic successfully triggered a notification for a user watching the tag.
Hello there,
I am part of the plentymarkets forum. Meanwhile also as an employee of plentymarkets. I have noticed that the subscription function does not react when a tag is inserted into a thread afterwards. It only reacts if the tag is set when creating the thread.
But I would also like to see the topics that are tagged later. What can I do?
best regards
Daniel
Friendly bump 
I can confirm that adding a tag after topic creation doesn’t trigger any notifications for watched tags. I’m moving this to the Contribute > Bug category.
Hello @gerhard,
thank you for changing the category. As i have noticed, there is also the same bug when changing the category afterwards
It’s working for category changes in my tests with the latest version of Discourse.
Can we still repro this @tshenry?
No repro. Adding a tag to an existing topic successfully triggers a notification for a user watching the tag.