Hey there!
I searched for this bug and found a report from summer:
Just to summarize:
At the beginning of the fight minions are locked outside the platform
Minions don’t hit Lagon very accurate
Minions can’t be moved on the platform (they just stay wherever they were summoned
In addition to the previous report: My character movement lacks horribly during the fight. It’s not only an input delay. The character is doing running animations but starts moving a second later. Sometimes it feels that I’m targeting areas where I’m not allowed to go.
I tried to record a video, but it failed. I will tray again, soon.