Quest [A Stab in the Dark.] impossible to finish while doing "A Young Sapling" too

[Radytzu]

Quest [A Stab in the Dark.] where you have to purify Rotting Stratus Undead with the sticks gave by Sinku is impossible to finish while doing "A Young Sapling" that requires you to defeat Rotting Stratus Undead, i think there might be a conflict between having to kill them and "purify" them at the same time ( which transforms them into Friendly NPCs )