Netherite Armor turns back to Diamond Armor

Equipped Netherite Armor drops as Diamond Armor after dying while flying down with an elytra.

 

the equipments contained the following enchantments:

helmet: respiration 3; protection 4; mending 1.

elytra: mending 1

leggings: protection 4; thorns 2; unbreaking 3; mending 1

boots: protection 4: depth strideer 3: soul speed 3: mending 1

 

all the enchantments were transferred to the diamond armor

 

edit: I failed to reproduce the bug