Enchanted elytras will despawn instantly after dying in the nether. unenchanted elytras do not. To reproduce, enchant a set of elytras with Mending I and Unbreaking III, go into the nether and die by any means that wont destroy the item like in lava. I used fall damage. When you go back to collect the items, the elytra will not be there.
Comments 3
This does not seem to be similar. My issue was very specific to the enchanted elytras only going missing when dying in the nether by any means. everything else would not disappear. I first noticed it when killed by piglins and when returning, my elytra would be missing. Tested also in a new creative world by just standing on magma block, fire, and fall damage in the nether. each time I returned, the enchanted elytra would be the only thing missing.
Though I just tested this in version 1.16.0.60 and 1.16.0.61 and appears to be fixed when repeating the previous tests done in 1.16.0.59.
Are you sure you did not experience MCPE-48370 (case C, death from falling)?