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This pull request addresses MC-17876, which causes attribute modifiers of equipments are applied after the entity health is set, leading to health loss on reload/rejoin.
This PR fixed the issue by loading equipment attributes before the max health is determined to prevent the health from being clamped to base value.
To reproduce
Type command
/item replace entity @s armor.head with iron_helmet[minecraft:attribute_modifiers=[ {id:"test",type:"max_health",amount:6,operation:"add_value"}]], quit the server after health regen, the extra health will lost upon rejoin without this fix.