Tristana e passive does not trigger if the target is killed by the bonus damage from energize

As the title says... i noticed it the last time i played trista and took stormrazor rfc combo... autoattacks that used energize passive didnt proc her e's passive explosions when they killed the target (in this case a minion) while the ones that didnt have energize's effect on did. Then i took her into the practice tool and noticed that this only happens if the target is killed by the bonus damage from the energize passive, if you take the target to low enough health the passive will trigger regardless. I dont think this is intended so i leave it here.