UCSD wl for transfers

Does anyone know around what time last year did transfers who were on the UCSD wl get off? If first years are barley hearing back do transfers not start til July?
Also, i’m currently committed to UC Davis and curious how canceling housing will go if I do get off the UCSD waitlist. I read the housing contract and pretty sure it’s just a $75 fee but the June 15th deadline scares me.
Ty in advanced.