Ability Queue/Input Buffer Issues?

Idk if that is that right name for it, but after last patch it doesn't want to work for me.

By ability queue/input buffer I mean when you target an enemy with an ability while out of range then flash into range to instantly cast the ability when available. It seems since last patch it won't work for me, I queue the ability then flash but I don't do anything. I'm 95% positive I was in range because at one point I tried to flash feast an enemy veigar and flashed on TOP of him but just stood there. Idk if this is a bug or undocumented change, but ive been really sad lately when I try it and just waste a summoner and sometimes die instead of getting a kill. Part of me thinks it had something to do with those Tahm Kench Q + W changes but I know very little about coding. I play with the normal casting and default hotkeys.

Anyone else having the same issue?