Arrows shot by a skeleton/stray and deflected by a player that kills a creeper does not drop music discs

Arrows shot by a skeleton/stray and deflected by a player that kills a creeper does not drop music discs. This can be reproduced by digging a 5x5x5 hole and spawning creepers, and then placing a skeleton at the opposite end of the player trapped in a small corridoor that is far enough for the skeleton to still be able to shoot. The arrows that are deflected by the player hit the creeper and they should drop music discs when they get killed. This is not the case