Wither roses dropped even if doMobLoot is set to false

The bug

When setting gamerule doMobLoot false, mobs killed by a Wither still drop wither roses, even if other drops do get disabled.

Code analysis

For 20w07a using Mojang names

net.minecraft.world.entity.LivingEntity.createWitherRose(LivingEntity) does not check the doMobLoot (or any other) gamerule when creating the wither rose item entity.