Bug that is affecting my gameplay: Flash and targeted abilities. Bug or balance change? answer pls

I noticed a bug that is hugely affecting my gameplay: Before, everytime i pressed a targeted abilities ( ex: annie Q, master yi Q, garen ultimate, etc...), the champion would start moving towards the enemy champion, and if i flashed after targeting that champion, the spell would be instant after flash (ex: if I tageted an enemy champion with talon's E and pressed flash, he would teleport a huge distance, the range of his E plus the range of the flash, and that was really useful for turret dives or killing someone who was next to his team).

I noticed yesterday that this no longer happens. I was playing annie and the enemy had low hp, but a bit too far in range of my Q, so i pressed Q, started moving and flashed, I should've used my q instantly, but for some reason i just flashed and didn't use the spell, and it was really awkward (annie noob omfg, you know how the community is..) This also happens with talon E's, so if i want to teleport to a far away enemy i cant target him and press flash, i have to use the spell again after flash, and in that moment the enemy can just flash or walk away.

Is this a bug, or just a balance change?