There always was something slightly odd about the timings for paper tickets. I switched to a smart card this year and the gates work so much better with the smart card.
With paper, there is a slight pause and if you continue at a normal walking pace, the gate starts to open and then slams shut because you are too close. There is no reliable option but to stop and wait for it to process the ticket or to tailgate somebody with a smartcard.
I am not quite sure what the tailgate mechanism is because I have managed to get five people through on a family ticket but maybe they are coded specially.
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