There may be something in that you suggest. Certainly in this day and age with modern technology at his dsposal, there may well be some way of the referee stopping the clock on display when he stops his own watch. That way there would never be any dispute.
I agree re his timekeeping. I thought Locadia should have probably had a penalty too when he was wrestled to the ground in the 2nd half. Surprised too that Lee Mason didn't check with VAR.