Repro:
1. Pick Morphling and get Aghanim's Scepter and some other items
2. Create an allied Lone Druid and level up Summon Spirit Bear
3. Create a Hybrid illusion of the Lone Druid
4. Spawn a Spirit Bear with your Hybrid Lone Druid
5. Give your Spirit Bear some items
6. Wait for the Hybrid Lone Druid to expires

Result: When the Hybrid LD expires, the bear dies, of course. However, all items you gave to it are still in its inventory and lost forever, since you cannot respawn it.

Expected: When Rubick gives his Spirit Bear item and he then loses the Summon Spirit Bear spell, the bear dies and all items in its inventory drop. The same should happen when the Hybrid Lone Druid dies.