As long as the judge scores and records the trip under the correct number it’s NBD as long as it only happens occasionally. Generally it’s in those open card situations with a schooling round and two division classes or two schooling rounds and a division class( one reason why rareds limit the number of open cards).
A good gate person, judge and sharp office staff can and do keep track of such things and it’s rare for it to result in a repinning. Also rare for a repeat, judge does not have to score it-it’s a PITA.
At small unrateds with volunteer help? Good luck with that. That’s why you need to check your bill to make sure you don’t pay for somebody else’s trip.
