Didn`t you know Ivy can carry allies while they cast abilities? Well you do now, they inflict only 50% of their damage though, since if was patched when people abused it heavily with Ivy+Seven ult
Try tools for manually cleaning your memory, for example ISLC from Wagnard software. When fps dropped happens - press "Purge standby list" and see if it helps. I don`t believe its a leak, because else it will happen to everybody.
can confirm that. One game, i was standing on balcony in our base (where 2 guardians stand below), haze pressed ult below me, I died. There was no direct line of sight for sure