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Fix Minecraft 26.3 play packet mappings - #3670
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dmulloy2
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Sep 25, 2026
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Minecraft 26.3 adds three clientbound play packets and replaces the serverbound swing packet with punch. Without the updated IDs, the dynamic
ADD_TRANSIENT_BLOCKtype collides withUNLOAD_CHUNKat0x25, which can route transient-block packets to chunk-unload listeners and cause aClassCastException.This updates the complete affected 26.3 play packet ranges, adds the new packet types and protocol version 777, preserves
ARM_ANIMATIONas a deprecated API constant, and tags 26.3 mappings so registry tests on older supported servers ignore future-only packets.Validation:
./gradlew :paper:test --tests com.comphenix.protocol.PacketTypeTest --tests com.comphenix.protocol.injector.packet.PacketRegistryTests./gradlew test./gradlew build shadowJar