Rek'sai -Sated Devourer (phantom hit working with Q)

I was trying something on Rek'Sai today and I got the Sated devourer. I had a lot of items with on-hit effect. These items are : boots of mobility, zrot portal, ravenous hydra, frozen mallet, trinity force and of course sated devourer. When I was activating Q and start hitting a monster, the phantom hit wasn't triggered as it is supposed to (i think) BUT when i started with a simple autoattack and activated q (after the 1st hit-autoattack), phantom hit was activated for the next 3 attacks. The strange thing is that, to do this, the autoattack should not be empowered with trinity's spellblade

to make this more simple start with Q doesn't trigger phantom hit start with autoattack and then activate Q phantom hit is triggered 3 times start with empowered autoattack (spellblade) and then activate Q phantom hit in NOT triggered

im not sure if this is a bug but anyway i think it's worth taking a look