Using trigger rules with both file include and comment exclude does not work

I am trying to trigger a build based on VCS changes if a specific file is modified *except* if the VCS comment has a specific word in it. I've tried a few ways to do this but the build always triggers.

Example trigger rules:

-:comment=nobuild:**
+:file.yaml

However, if I submit a change to file.yaml and the comment attached to the change is just 'nobuild' then the build is still triggered.

I've tried changing the order, being more explicit with the regex but it's the same result.