Hi Devs,
All morning, I've been casting on KR (in war) and I drop from 13% to 9% mana every time. I took a bunch of photos of it.
Your personal Support ID is CD6F4E12
I just realised while writing this that I shouldn't be getting 4% mana regen per tick anyway, right? So maybe it's not a casting bug, but rather a mana display error? Either way, I am definitely at 13% when I cast, and then at 9% when I have casted.