On my bedrock realms server, I've had mobs drop protection 4 diamond helmets and chestplates with the Flow trim recently in Ominous Trial Chambers, but I don't believe they're supposed to drop them. I've collected 4 of each in diamond (all prot 4, different damage levels) over the last 3 ominous trial chambers I've visited. It's seemed to be skeletons dropping them most often in my experience, but that could just be chance. I don't think we've had them drop on the trial chambers that came out before the creaking update, and we've done like 5 ominous trial chambers before that update.
Possibly related, I did actually find a 3/4-full diamond armor zombie in the wild recently, and it actually dropped all 3 pieces of (unenchanted) armor on death. I know this is technically possible, but it's VERY unlikely to happen, even though I had looting 3 on my sword.
Linked issues
is duplicated by 4
Comments 5
confirmed
zombie also drop diamond armor. for me, the mobs can drop any pieces of their gear: swords, bows, chain mail armor etc.
note: I did some experiments and found that the armor trial chamber mobs have never has anything other than protection 4. I'm pretty sure there should be 2 other protections with it.
For the second part of this report, the zombie dropping all their unenchanted diamond gear is intended by a low drop chance (increased by Looting). You just got lucky by chance.
For the first part, I have not yet confirmed this report.