Homeplug AV Tone Map

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Wireshark Version 2.6.10 (Git v2.6.10 packaged as 2.6.10-1~ubuntu16.04.0) shows: (same problem in Wireshark Version 3.0.6)

HomePlug AV protocol
    MAC Management Header
        .... ...1 = Version: 1.1 (1)
        Type: Tone Map Rx Characteristics Confirmation (0xa091)
        Fragmentation Info: 0x2019
    Vendor MME
    Tone Map Rx Characteristics Confirmation
        Status: Success (0x00)
        Reserved
        Length: 3268
        MME Subversion: 0
        Reserved
        Peer address: xxx (xxx)
        Slot: 0
        .... 0010 = Coupling: Unknown (2)
        Number of Tone Maps in use: 6
        Reserved
        Tone map number of active carriers: 2690
        Reserved
        Guard Interval Length (GIL): 0
        Reserved
        Automatic Gain Control (AGC): 14
        Reserved
        Tone Map carriers (Total #ModulatedBits=19058 bit, Active #Carriers=2390, Average #Bits/Carrier=7,97 bit), Average SNR/Carrier=22,56 dB)

Slot 0 (in 1 byte) looks good.

HomePlug AV protocol
    MAC Management Header
        .... ...1 = Version: 1.1 (1)
        Type: Tone Map Rx Characteristics Request (0xa090)
        Fragmentation Info: 0x0000
    Vendor MME
    Tone Map Rx Characteristics Request
        Reserved
        Peer address: xxx (xxx)
        Tone Map slot: 0
        .... 0000 = Coupling: Primary (0)

Request is slot 0 (in 1 byte)

HomePlug AV protocol
    MAC Management Header
        .... ...1 = Version: 1.1 (1)
        Type: Tone Map Tx Characteristics Confirmation (0xa071)
        Fragmentation Info: 0x2018
    Vendor MME
    Tone Map Tx Characteristics Confirmation
        Status: Success (0x00)
        Length: 3264
        Reserved
        Peer address: xxx (xxx)
        Slot: 512
        Number of Tone Maps in use: 1542
        Tone map number of active carriers: 2690
        Reserved
        Tone Map carriers (Total #ModulatedBits=20250 bit, Active #Carriers=2414, Average #Bits/Carrier=8,39 bit), Average SNR/Carrier=23,75 dB)

Confirmation is Slot 512 (in 2 bytes)

Is it a bug?

Where is the specification for

Tone Map Tx Characteristics Confirmation (0xa071)

Tone Map Rx Characteristics Request (0xa090)

Tone Map Rx Characteristics Confirmation (0xa091)