Donkey inventory not saved

Hello,

DUPLICATE OF MC144243, Sorry Jira don't say me the first has been well saved.
You cant close here

if you tame a donkey. and you put him a chest.
All the items whose saddles assigned to the donkey disappear.

Just be on the donkey. open the donkey's inventory, put items in the inventory or saddle in the intended location. close the inventory and reopen the inventory. and find that everything has disappeared