(Gameplay) Aurelion Sol does not get Urf bonus on nexus blitz urf mode

Aurelion Sol normally gets multiple stars as he levels up his ultimate in Urf- however, in this quick version on Nexus blitz, he maintains his standard 3 stars. I'm aware that the multiple star increase doesn't happen until level 6- but I was past that level when the urf challenge started and still only had 3 stars the whole time.

Hope y'all can look into this! Thanks