Task T96041 introduced new magic word __EXPECTUNUSEDCATEGORY__, however adding it to a page displays the word on the page as shown in the screenshoot below:
Description
Description
Related Objects
Related Objects
Event Timeline
Comment Actions
It can't be added until the change is deployed. If added before it's considered normal text, not a magic word.
Comment Actions
That makes sense. I did not realized that was not deployed yet. If that is the case than unless there are objections I will withdraw this bug report.