Mention Linking
One answer
"Mentions" hyperlinks are set up when the words "work item" and then the ID number are used in the Summary, Description or Discussion fields. Also, I've seen "mentions links" created when you have the work item type followed by a number in these fields.
To make sure you don't get these mentions links created, you'll have to look at the Summary, Description, and Discussion fields and be sure that if a work item type is followed by a number, you put in a character that defeats that pattern (like an underscore instead of a space between the work item type and the number).
Hope this helps.
Comments
So does that mean the the following field types are "mentioned active"
Large HTML
Medium HTML
Comments
Other fields like, small string, medium string and long string are not affected by the mentions functionality?
I need to create a field to import history from another system where the mentions action will not get triggered.
Those are the field types used by Summary, Description and Discussion. It's worth a shot.