End Crystals are unaffected by the mobGriefing game rule, doing damage to blocks even with said game rule disabled. This behavior seems out of place considering it's the only entity besides TNT(which serves no other purpose than destroying blocks) that does block damage during direct player interaction with the game rule disabled.
Edit: I tested this interaction in Bedrock Edition, the End Crystal does not damage blocks in that version when the game rule is disabled. This reassures me in believing that this behavior is unintentional.
To reproduce:
-Create a world, preferrably with commands enabled
-Summon or locate an End Crystal
-Use /gamerule mobGriefing false
-Place blocks that can be blown up nearby
-Hit the crystal
-The nearby blocks get destroyed
(Fixed typo)
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An end crystal isn't a mob, you're right. I did however just test the interaction in Bedrock Edition and there the explosion does not damage blocks when mobGriefing is disabled.
Thank you for your report!
We're tracking this issue in MC-11630, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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…an endcrystal isn't a mob