Tristana E bug, Active does not detonate when a minion dies, bomb still goes off after 4 secs

So i've been noticing today while doing missions on , namely in co-op mode(Got her Dragon Trainer skin finally perm'd from hextech yesterday, whooo!), that whenever a minion dies with E marked, the bomb doesn't explode(instead you still hear the sound effect and then it goes off at the 4 second mark still as if it was still attached to a target) which if i recall was working fine yesterday i believe. I have had 2 matches with tristana and it happened every time, clearly this must be a sign that Riot needs to do a serious update on the yordel gunner so she isn't in such a bad position if we end up with a ridiculous bug like this on her...

I've ranted plenty of times (even if i do know a few seasons back she WAS a very strong pick) on this i guess, but its not like we had any other yordel marksmen and pretty much every other one is some strong as heck mc'guffin bringer. Don't recall must on them getting any serious gameplay bugs...

Never the less, Riot plz fix this E bug and maybe consider giving a few improvements on Trist's early game maybe?

UPDATE:

So apparently the bug only seems to trip in co-op mode 'intro', it did not trip at all in 3vs3 intermediate co-op mode.