When Mobs are killed with any ranged weapon they will drop XP and loot as normal but will never drop weapons or armor. I have tested it on both a realms survival server and single player creative test world. I have specifically tested skeletons, zombies, and zombie pigmen. I have also tested both arrows and tridents. It looks like all illagers are unaffected by this bug, at least those spawned by a raid.
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[Mojang] Mega_Spud (Jay)
migrated
Thank you for your report!
We're actually already tracking this issue at MCPE-44408, so we will resolve and link this ticket as a duplicate.
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