[Gameplay] Karthus Q Bug (Easy Fix Serious Problem)

As a Karthus main, I noticed this bug and it is happening a few times every game I play him. (Missed 3 Kills because of it last game ) . This is how it happens: Karthus casts Q - Lay Waste before it explodes, within the 0.5 seconds casting time, Karthus reaches 0 hp and Death Defied activates. the casted Lay Waste does not explode and does not deal damage. This bug also happens in a similar way at the end of Death Defied, but not always.

• Karthus is defying death
• Karthus casts a Q - Lay Waste
• before it explodes, within the 0.5 seconds casting time, the duration of Death Defied ends.
• the casted Lay Waste does in some cases not explode and does not deal damage.

So basically, when karthus transitions from alive>dead or dead>really dead any Q's that are cast but havent finished casting are canceled. This is a pretty big deal for a champion designed around dying.

Lets say you are dueling someone and right before you die you place a perfect Q to finish your opponent. As soon as you die the Q is cancelled even if it was cast before your death.

Would appreciate it if you guys could fix this bug

Also I would like to add that when karthus transitions to death defied there is a cast time delay- so he cannot cast a q in those precious few seconds after changing forms and any Q cast slightly before death is cancelled. Riot Fix this!!!! So many noobs getting away on the last cast.