Closely relates to MC-212764. Since that ticket is intended, this one may be as well.

The bug

Despite being immune to explosions, nether stars can be destroyed via fire or lava. This can be a problem especially when fighting the Wither in the Nether or near caves containing lava, leading to destruction of the item.

How to reproduce

1. Obtain a nether star
2. Throw it in lava
3. Reconsider your life choices

Expected results

The nether star would be completely unaffected, much like netherite is

Actual results

It burns just like any other item.