By selecting the power TWICE AS ICE, and using CRYO-FREEZE before using ICE WALL, you have effectively stored an ICE WALL.
You can then use 2 ICE WALLS in a team fight, before resetting the ICE WALL cooldown using CRYO-FREEZE, meaning you can use 3 ICE WALLS in a team fight altogether before waiting for cooldowns.
I have tested this in the practice range, and the bug is with the stadium power TWICE AS ICE and no other perks or powers.
Additionally, you cannot store more than 1 ICE WALL.
Based on what I’m seeing, I believe this is just how the power works. The specific wording of the power is “reset the NEXT cooldown of [Ice Wall]”. Which I interpret to mean the next time it goes on cooldown (you use it) automatically set the cooldown to 0 (thus allowing you to use it again immediately). And, testing it, it’s not like you can place both walls at once anyway, you have to destroy the first one to place a new one, or wait for it to expire. I think it wouldn’t have the word “next” in there if it weren’t intentional, as next implies it can be used after you use cryo-freeze, and thus it is the “next” cooldown for it, whereas if it didn’t say “next” it would imply that it would have to currently be on cooldown to reset the cooldown. Though of course I could be wrong.