I was confused with Timer tags.
I didn't know if I made a timer "hello world" if it would be treated as two separate tags: "hello" and "world". (The manual doesn't clarify this.)
Whereas in other parts of Construct, the tags do allow for a sentence like "hello world" to be treated as multiple words. From memory, sprite object tags, and the audio plugin tags, work this way.
When I went to stop the tag "hello" it did not stop the "hello world" timer.
(I suppose if it was changed it may be a breaking change for some projects? But's fine, there could just be a legacy setting for old projects.)