Bug in V9.0.12 in grouping

In version V9.0.12 if I make a grouping in a grid and I want to show a field that has Lookup for example the seller and
I want it to show the seller and seller’s name (in the detail if it works) but in the group no, it only puts the Seller’s No.

If in the detail I have a field declared as date and use it in the grouping shows me as date and time.
I think this is a problem of version 9, since in version 8.1 if it worked.