Edit a subject of an existing topic in that category
Create a new tag by entering a new tag name into the tag area
Save the subject
Althought it seemed it was possible to add the tag, it won’t appear after saving (as it was not allowed). But when you look at the end of the topic, a whisper post was created that mentions the change of the tag.
Expected behavior: The whisper should not mention tags that were not created at all.
