Similar bug to one that's marked resolved:

I had a mule, I took it traveling pretty far from base. It had chest attached with loot.  I ride in 3rd person.

A day ago when I dismounted, it disappeared for a few seconds. This happened 3 or 4 times. Today after having no problems, I dismounted and it disappeared completely along with loot. It happened in desert and savanna. Final bug happened in savanna village.

The mule was nametagged too.