Mobs with the Invulnerable tag cannot be attacked in Survival Mode, but they can be attacked in Creative Mode. But you can't do that with a spear. Reproduce:
Make sure you're in Creative Mode.
Summon a Creaking with the Invulnerable tag using command: /summon minecraft:creaking ~ ~ ~ {Invulnerable:1}
Take the sword.
Hit the Creaking.
Your attack will cause to his death.
Take the spear.
You won't be able to kill him using a normal attack or a running attack.
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duplicates 1
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Duplicate of MC-304028
Hi!
Thank you for your report!
However, this issue is Working As Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, Redstone, villagers, and animals may not work the same in current versions.
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