My intrepretation is that no reinforcement shall exceed 1/8". That applies for groove welds and fillet welds. Groove welds, does not matter what position it is in, especially Tee joints where the welder gets in the habit of putting a big fillet weld on top of a full pen weld when it should have been filled to at least flush no more than an 1/8" over, but they get used to doing fillet welds, so they put a fillet weld OVER a full pen weld when it wasn't needed.
Chris