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Fix custom_click_action payload (length-prefixed optional NBT) for 1.21.6+ #1196

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Fix custom_click_action payload (length-prefixed optional NBT) for 1.21.6+ #1196

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8204b75
Fix custom_click_action payload encoding for 1.21.6+
atiweb Jun 15, 2026
c938191
Apply custom_click_action length-prefixed-NBT fix to all 1.21.6+ vers…
atiweb Jun 17, 2026
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8 changes: 3 additions & 5 deletions data/pc/1.21.11/protocol.json
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@
"registryEntryHolder": "native",
"registryEntryHolderSet": "native",
"lpVec3": "native",
"nbtOptionalLengthPrefixed": "native",
"ByteArray": [
"buffer",
{
Expand Down Expand Up @@ -4927,11 +4928,8 @@
"type": "string"
},
{
"name": "nbt",
"type": [
"option",
"anonymousNbt"
]
"name": "payload",
"type": "nbtOptionalLengthPrefixed"
}
]
]
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3 changes: 2 additions & 1 deletion data/pc/1.21.6/proto.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@
anonOptionalNbt: native
registryEntryHolder: native
registryEntryHolderSet: native
nbtOptionalLengthPrefixed: native
ByteArray: ["buffer", { "countType": "varint" }]
string: ["pstring", { "countType": "varint" }]
vec2f:
Expand Down Expand Up @@ -1330,7 +1331,7 @@
# MC: ServerboundCustomClickActionPacket
packet_common_custom_click_action:
id: string
nbt?: anonymousNbt
payload: nbtOptionalLengthPrefixed

^handshaking.toClient.types:
packet:
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8 changes: 3 additions & 5 deletions data/pc/1.21.6/protocol.json
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@
"anonOptionalNbt": "native",
"registryEntryHolder": "native",
"registryEntryHolderSet": "native",
"nbtOptionalLengthPrefixed": "native",
"ByteArray": [
"buffer",
{
Expand Down Expand Up @@ -3618,11 +3619,8 @@
"type": "string"
},
{
"name": "nbt",
"type": [
"option",
"anonymousNbt"
]
"name": "payload",
"type": "nbtOptionalLengthPrefixed"
}
]
]
Expand Down
3 changes: 2 additions & 1 deletion data/pc/1.21.8/proto.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@
anonOptionalNbt: native
registryEntryHolder: native
registryEntryHolderSet: native
nbtOptionalLengthPrefixed: native
ByteArray: ["buffer", { "countType": "varint" }]
string: ["pstring", { "countType": "varint" }]
vec2f:
Expand Down Expand Up @@ -1330,7 +1331,7 @@
# MC: ServerboundCustomClickActionPacket
packet_common_custom_click_action:
id: string
nbt?: anonymousNbt
payload: nbtOptionalLengthPrefixed

^handshaking.toClient.types:
packet:
Expand Down
8 changes: 3 additions & 5 deletions data/pc/1.21.8/protocol.json
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@
"anonOptionalNbt": "native",
"registryEntryHolder": "native",
"registryEntryHolderSet": "native",
"nbtOptionalLengthPrefixed": "native",
"ByteArray": [
"buffer",
{
Expand Down Expand Up @@ -3615,11 +3616,8 @@
"type": "string"
},
{
"name": "nbt",
"type": [
"option",
"anonymousNbt"
]
"name": "payload",
"type": "nbtOptionalLengthPrefixed"
}
]
]
Expand Down
3 changes: 2 additions & 1 deletion data/pc/1.21.9/proto.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@
anonOptionalNbt: native
registryEntryHolder: native
registryEntryHolderSet: native
nbtOptionalLengthPrefixed: native
lpVec3: native
ByteArray: ["buffer", { "countType": "varint" }]
string: ["pstring", { "countType": "varint" }]
Expand Down Expand Up @@ -1560,7 +1561,7 @@
# MC: ServerboundCustomClickActionPacket
packet_common_custom_click_action:
id: string
nbt?: anonymousNbt
payload: nbtOptionalLengthPrefixed

^handshaking.toClient.types:
packet:
Expand Down
8 changes: 3 additions & 5 deletions data/pc/1.21.9/protocol.json
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@
"anonOptionalNbt": "native",
"registryEntryHolder": "native",
"registryEntryHolderSet": "native",
"nbtOptionalLengthPrefixed": "native",
"lpVec3": "native",
"ByteArray": [
"buffer",
Expand Down Expand Up @@ -4637,11 +4638,8 @@
"type": "string"
},
{
"name": "nbt",
"type": [
"option",
"anonymousNbt"
]
"name": "payload",
"type": "nbtOptionalLengthPrefixed"
}
]
]
Expand Down
3 changes: 2 additions & 1 deletion data/pc/latest/proto.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@
registryEntryHolder: native
registryEntryHolderSet: native
lpVec3: native
nbtOptionalLengthPrefixed: native
ByteArray: ["buffer", { "countType": "varint" }]
string: ["pstring", { "countType": "varint" }]
vec2f:
Expand Down Expand Up @@ -1637,7 +1638,7 @@
# MC: ServerboundCustomClickActionPacket
packet_common_custom_click_action:
id: string
nbt?: anonymousNbt
payload: nbtOptionalLengthPrefixed

^handshaking.toClient.types:
packet:
Expand Down
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