set_creative_slot failure

[ ] The FAQ doesn't contain a resolution to my issue

Versions

• minecraft-protocol: 1.35.0
• server: vanilla 1.18.2
• node: v16.6.2

Detailed description of a problem

When sent the packet fails go through the minecraft server and give me. Seems like it's not correct.
[18:23:17] [Server thread/INFO]: AlphaServer lost connection: Internal Exception: io.netty.handler.codec.DecoderException: java.io.IOException: Packet 0/40 (wv) was larger than I expected, found 24 bytes extra whilst reading packet 40

Current code

var Item = {
    "present": true,
    "itemId": 847,
    "itemCount": 1,
    "nbtData": {
        "type": "compound",
        "name": "",
        "value": {
            "Decorations": {"value": {"type": "compound","value": []}},
            "map": {
                "type": "int",
                "value": 15
            }
        }
    }
}
client.write("set_creative_slot",{
    "slot": 45,
    "item": Item
})

Expected behavior

Should set slot 45 to a map

Start by comparing the set_creative_slot payload in the current code with the protocol definition for Minecraft 1.18.2, focusing on the supplied Item NBT structure and slot 45. Done means the server accepts the packet without the DecoderException and slot 45 contains the map.