The bug

Normally you are not able to destroy netherite when thrown into lava/fire, however this can be bypassed by crafting a lodestone block.

To Reproduce

1. Throw a netherite ingot into the lava
   → The netherite ingot isn’t destroyed
2. Use that same netherite ingot to craft a lodestone and throw the lodestone into lava
   → The netherite ingot used to craft the lodestone is also destroyed alongside it

Related to my previous bug report, MC-176615.

Edit: This report has been marked as Working as Intended. Lodestone not being fireproof is intended, but it shouldn't be intended for the netherite ingot to be destroyed as well (by fire). However, this is Mojang's call so I shall respect their decisions. I have renamed this report to be more concise to my point.