I'm not sure if this is a feature or a bug but either way it needs to be fixed. This discourages the use of potions, (especially splash potions). Regardless of how a mob is killed, the exp and item drops should always be the same.
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I did not disable anything. Make a spider trap and then throw two-three harming potions on the group of mobs and they die but no items or exp drop. If I spend 30min killing the mobs by punching them, they drop items and exp just fine.
Image one shows the group of spider mobs that the harming potions are used on.
Image two is directly under the mobs after killing them with a few splash potions of harming.
When killing them by punching, image two has tons of item and exp drops waiting to be picked up. Potion kills just dont yield anything.
You're not using the PC (Java) edition. You need to report it here: https://bugs.mojang.com/browse/MCPE
Cannot reproduce. Did you disable the doMobLoot gamerule?