Improve labeled chest caching interactions

mosfet/protocol/modern.py

@@ -4,7 +4,9 @@ import time
 from contextlib import nullcontext
 
 from minecraft.networking.packets import Packet
-from minecraft.networking.types import Float, Long, VarInt, VarLong
+from minecraft.networking.types import (
+    Float, Long, UnsignedByte, VarInt, VarLong,
+)
 from minecraft.networking.modern import (
     ChatCommand, ClientboundPlayerChatPacket, ServerboundChatPacket, SystemChat,
 )
@@ -29,6 +31,13 @@ class UpdateTimePacket(Packet):
             })
 
 
+class PlayerInputPacket(Packet):
+    """Serverbound key state, including sneak for container-safe placement."""
+    id = 0x2B
+    packet_name = 'player input'
+    definition = [{'flags': UnsignedByte}]
+
+
 class PlayerCommandPacket(Packet):
     """Client player-command packet; action 0 stops sleeping (protocol 777)."""
     id = 0x2A