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Is there a typo / auto-correct in your question?
Is the field wlan.eht.phy_capabilities.bits_64_71 EHT PHY Bits 64-71? (Wireshark dfef: wlan)
(EHT not ETH)

Fixed in 23352: ieee80211: update code to final 802.11be amendment .

    {&hf_ieee80211_eht_phy_bits_64_71,
     {"EHT PHY Bits 64-71", "wlan.eht.phy_capabilities.bits_64_71",
-     FT_UINT24, BASE_HEX, NULL, 0x0, NULL, HFILL }},
+     FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},

(See sample capture ieee80211_eht_ml_sta_profile.pcapng attached to 19425: ieee80211 elements filter in EHT Multi-link sta profile)

EHT PHY Capabilities Information
    EHT PHY Bits 0-15: 0x0008
    EHT PHY Bits 16-31: 0x0000
    EHT PHY Bits 32-39: 0x00
    EHT PHY Bits 40-63: 0x000c30
    EHT PHY Bits 64-71: 0x002200
        .... ...0 = Rx 1024-QAM In Wider Bandwidth DL OFDMA Support: Not supported
        .... ..0. = Rx 4096-QAM In Wider Bandwidth DL OFDMA SUpport: Not supported
        .... .0.. = 20 MHz-Only Limited Capabilities Support: Not supported
        .... 0... = 20 MHz-Only Triggered MU Beamforming Full BW Feedback And DL MU-MIMO: Not supported
        ...0 .... = 20 MHz-Only MRU Support: Not supported
        000. .... = Reserved: 0x0

Is there a typo / auto-correct in your question?
Is the field wlan.eht.phy_capabilities.bits_64_71 EHT PHY Bits 64-71? (Wireshark dfef: wlan)
(EHT not ETH)

Fixed in 23352: ieee80211: update code to final 802.11be amendment .
(There is a bug fix bundled in with this merge that has not been cherry picked back to the 4.6 branch.)

    {&hf_ieee80211_eht_phy_bits_64_71,
     {"EHT PHY Bits 64-71", "wlan.eht.phy_capabilities.bits_64_71",
-     FT_UINT24, BASE_HEX, NULL, 0x0, NULL, HFILL }},
+     FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},

(See sample capture ieee80211_eht_ml_sta_profile.pcapng attached to 19425: ieee80211 elements filter in EHT Multi-link sta profile)

EHT PHY Capabilities Information
    EHT PHY Bits 0-15: 0x0008
    EHT PHY Bits 16-31: 0x0000
    EHT PHY Bits 32-39: 0x00
    EHT PHY Bits 40-63: 0x000c30
    EHT PHY Bits 64-71: 0x002200
        .... ...0 = Rx 1024-QAM In Wider Bandwidth DL OFDMA Support: Not supported
        .... ..0. = Rx 4096-QAM In Wider Bandwidth DL OFDMA SUpport: Not supported
        .... .0.. = 20 MHz-Only Limited Capabilities Support: Not supported
        .... 0... = 20 MHz-Only Triggered MU Beamforming Full BW Feedback And DL MU-MIMO: Not supported
        ...0 .... = 20 MHz-Only MRU Support: Not supported
        000. .... = Reserved: 0x0