MU Beamformee support?

[Martin-Éric Racine]

(non-subscriber; please keep me in CC)
Greetings,

Having recently purchased an AC1300 dongle supported by the
rtw88_8822bu Linux driver, I ran into an unexpected VHT feature during
configuration.

The relevant 'iw list' fragment:

VHT Capabilities (0x03d071b2):
    Max MPDU length: 11454
    Supported Channel Width: neither 160 nor 80+80
    RX LDPC
    short GI (80 MHz)
    TX STBC
    SU Beamformee
    MU Beamformee

The last line is what baffles me: The hostap.conf example in upstream
hostapd Git has an option for "MU Beamformer" but there is no mention
of "MU Beamformee" anywhere.

Typo in the Linux rtw88 driver or missing configuration option in hostapd?

Cheers!
Martin-Éric