Plugin (lua) shows name but nothing else

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Hi there, I have a lua script for separating data, as shown I can see the name of the protocol but there is nothing else. There should be a drop down where all the data is sorted so I can read the data better. Does anyone know where the bug is here? Thank you very much.

    -- Definieren der Protokollinformationen
local p_wsci = Proto("wsci", "Workstation Control Interface")

-- Definieren der Felder, die im Protokoll angezeigt werden sollen
local f_wsci_action = ProtoField.string("wsci.action", "Action")
local f_wsci_data = ProtoField.string("wsci.data", "Data")

p_wsci.fields = {f_wsci_action, f_wsci_data}

-- Definieren der Dissektor-Funktion
function p_wsci.dissector(tvb, pinfo, tree)
    pinfo.cols.protocol:set("WSCI")
    pinfo.cols.info:clear()

    local subtree = tree:add(p_wsci, tvb())

    -- Überprüfung, ob die Daten mit 55555555000000b200000002 beginnen
    local data = tvb:range(0):bytes():tohex()
    print("Data: " .. data)  -- Print the data for debugging
    if string.sub(data, 1, 24) == "55555555000000b200000002" then
        print("Data starts with 55 55 55 55 00 00 00 b2 00 00 00 02")  -- Print a message for debugging
        -- Extrahieren der benötigten Ziffern
        local action = tvb:range(12):string()
        subtree:add(f_wsci_action, action)

        -- Extrahieren der Daten und Umwandeln von Hexadezimal in ASCII
        local hex_data = string.sub(data, 25)
        local ascii_data = ""
        for i = 1, #hex_data, 2 do
            local byte = string.sub(hex_data, i, i+1)
            ascii_data = ascii_data .. string.char(tonumber(byte, 16))
        end
        print("ASCII data: " .. ascii_data)  -- Print the ASCII data for debugging

        -- Aufteilen der Daten an den Kommas und Hinzufügen zu einem Dropdown-Menü
        local data_items = split(ascii_data, ',')
        for i, item in ipairs(data_items) do
            subtree:add(f_wsci_data, item)
        end
    end
end

-- Funktion zum Aufteilen einer Zeichenkette an einem Trennzeichen
function split(s, delimiter)
    result = {}
    for match in (s..delimiter):gmatch("(.-)"..delimiter) do
        table.insert(result, match)
    end
    return result
end

-- Registrieren vom Dissektor
local tcp_port = DissectorTable.get("tcp.port")
tcp_port:add(55671, p_wsci)