The orange base is an extension of the white base. Really just a bad call by the ump, but stuff happens. Hopefully he went home, looked into the rules, and now he knows.
Now if he fielded the ball in fair territory and touched the orange bag first for no particular reason, then the ump would be correct.
I was playing right field ... the ball went off his glove was over foul line by a few inches 1b momentum took him a foot or so into foul.ground ... runner had stopped so there was no possible collision 1b picked up the ball stepped across the bag touching orange then white. So touching orange first is a dead ball BR safe?
I think dead ball is wrong, but if the batter-runner would have continued through the play and beat the defender to the orange OR white side of the bag before the defender touches the white side of the double bag (NOT the Orange) then the BR would be safe.