EXHAUST BUG still not fixed.

I've been reporting this for years and Riot has still not fixed it.

I can't tell you how many fights I've lost because Exhaust can cause you to lose your target when minions are close. You lose target (without clicking anything else than the exhaust cast) and by the time you reacquire the target it's too late.

Example from the game I just got out of:

I was xin, opponent was teemo. He had minions close I did not. I charged, cast exhaust/ignite and instead of hitting teemo it switched targets off of him (after I landed the first shot on him) and onto the minion next to me. I didn't misunderstand what happened, I very clearly hit him and saw it, I checked the combat log to verify.

PLEASE!! fix this bug or at least communicate to me this is your intent for people to lose targets when casting exhaust, I'll stop using it if that's the case.