There are two entries in the Name Suggestion Index that ID uses for these suggestions. Both of them have only ice_cream;burger, including the Grill and Chill brand:
https://nsi.guide/index.html?t=brands&k=amenity&v=fast_food&tt=dairy%20queen
I don’t know enough about the topic to say whether that is appropriate, but that is where it is coming from. You could override it, but it is quite likely that another mapper using ID (or any editor that uses NSI) will change it later. If you want to encourage a more systematic change, it’s probably best done via NSI.