If you try to block an end crystal explosion with a shield, it'll still inflict you damage. The shield won't take any durability. A single end crystal explosion might be able to kill a full enchanted netherite armor player on hard difficulty, so the bug makes this item exploitable on servers.
This behavior has probably been in the game since shields began to block 100% of explosions (1.11) and has never been addressed, since this also seems to affect some other explosion types like beds or tnt.
How to reproduce
Summon or place an end crystal.
Equip a shield and get in front of it.
Summon an arrow 10-20 blocks above the crystal.
Quickly switch to survival and block with the shield.
→ ❌ You take explosion damage.
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I sincerely hope that it will still be marked WAI, because the shields and so OP, so still they will block end crystal explosions
Why would it be WAI? it doesn't make sense that it can't block end crystals/TNT explosions while creeper/charged creepers can be blocked. Not even a reduction of damage. Also, they aren't too expensive to craft. While i do agree that the shield is a bit OP, it isn't consistent when is supposed to block 100% of damage.
Affects 1.16 pre3