Conqueror Rune Bug on Diana Auto after using her Q+E combo

So practicing as a diana main using conqueror rune to get used to the new ult (her E) on diana I noticed there was a bug on her first auto after using her Q+E combo that conqueror doesn't actually increase on the first auto immediately after completing the combo. I don't know if Riot is aware of this but it is there however small it may seem. If you could look into it as to why that would be awesome thanks ^_^.

How to reproduce this 100% of the time.

1. Make Diana level 3 in the training tool and spawn a enemy dummy.
2. Cast Q, W and immediately Use E and then auto upon completing the dash. (Your conqueror will show 6 Stacks when in fact it should show 8 as you auto'd at the end of the E animation but this doesn't happen)
3. Repeat 2 over and over and it will always happen this is 100% guaranteed to bug every-time on stacking Conqueror.

However small it may seem a bug is a bug. Sorry for no video as I just found this out not even about 3 minutes ago while practicing.

Thank you for your time and I hope this small bug gets fixed soon.