Legends of Runeterra targeting bug. (you must target a spell on the stack) caused my arena loss.

[sg-shisa] Generally I don't post very often but I'm pretty upset I waste 3,000 shards on my arena run to get a loss because I couldnt stop his Rhasa's spell because my deny cant target it due to a bug. No matter where I click I am unable to use deny. I have zed, will of ionia and multiple game changing cards on top of my minotaurs stunning and being able to block his attackers next round. Thanks Riot!