Quarter tones in Dorico 3

Whenever I change the Tonality System from Equal Temperament 12-EDO to Equal Temperament 24-EDO and I choose one of the quarter tone accidentals, thhe Tonality System automatically defaults back to 12-EDO. Can anyone tell me why this is the case?

You have to add a 24-edo key signature. Follow these instructions precisely: https://www.steinberg.net/forums/viewtopic.php?t=138839#p747021