Netherite gets destroyed by lava when inside of a shulker box

If a netherite item is placed inside of a shulker box and then this shulker box falls into lava the netherite item gets deleted, even though netherite is immune to lava and fire.

Steps to reproduce:
1. Get a netherite item
2. Place it inside of a shulker box
3. Collect the shulker box
4. Throw the shulker box into lava

Expected results:
Shulker box should get burned but the netherite item should float up

Observed results:
Both the shulker box and the netherite item get burned and deleted.