Netherite items can be destroyed by anvils

Closely relates to MC-212764, MC-248613 and MC-248614.

The bug

Despite being impervious to lava, netherite items can still be deleted by a falling anvil.

How to reproduce

1. Throw something made of netherite on the ground
2. Place an anvil far above it such that it falls onto the item

Expected results

The item would not be destroyed by the anvil.

Actual results

It gets destroyed anyway.