is UPD Packet padding wrong?

[cherepanovic]

https://github.com/munhouiani/Deep-Packet/blob/ce15b900772a6691cb1762c6ec5ad7f19edc222e/preprocessing.py#L33C1-L44C50

def pad_udp(packet):
    if UDP in packet:
        # get layers after udp
        layer_after = packet[UDP].payload.copy()

        # build a padding layer
        pad = Padding()
        pad.load = "\x00" * 12

        layer_before = packet.copy()
        layer_before[UDP].remove_payload()
        packet = layer_before / pad / layer_after

        return packet

    return packet

If the UDP Packet should be padded with 12 bytes immediately after the UDP header but before the payload, then this code does not do what it should. It pads after the entire UDP packet.

https://scapy.readthedocs.io/en/latest/usage.html#stacking-layers