Also found the same thing, only provides a tag-like visual in the property, but obsidian doesn’t actually add the tag to their system
Have just come back to this to fully work it into my vault structure, and have found the same thing. You get tag behaviours in the field itself, but they don’t seem to be tags as far as the rest of the application is concerned. @mdbraber can you confirm if this is fully working for you, or are you seeing the same thing?