When a player dies to mobs in a trial chamber, gear such as their armor, weapons, and shield may be picked up by these mobs. When these mobs are killed, they do not drop this gear on death. In all other scenarios, mobs would be expected to drop this gear. This can be especially impactful when players have invested a lot of time into creating this gear.
Steps to replicate:
Go to trial chambers
Equip gear
Die to mobs spawned by a trial spawner
Kill mobs that have picked up your gear
Gear does not drop
Linked issues
Comments

Thank you for your report!
We're tracking this issue in MCPE-182630, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
We're tracking this issue in MCPE-182630, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Duplicate of MCPE-182630