802.11r + sae-mixed

Installing and Using OpenWrt Network and Wireless Configuration
1

802.11r with psk2+aes or with sae (with devices that support it) works fine
But I'm unable to connect 802.11r with sae-mixed ap from any device.
sae-mixed without 802.11r also works fine.

config wifi-iface 'iface'
        option disabled '0'
        option ifname 'ifname'
        option device 'radio5'
        option network 'lan'
        option mode 'ap'
        option ssid 'SSID'
        option key 'psk'
        option encryption 'psk2+aes'
#       option encryption 'sae-mixed'
#       option encryption 'sae'
        option ieee80211w '1'
        option ieee80211r '1'
        option nasid 'ap1.domain'
        option mobility_domain '1111'
        option ft_psk_generate_local '1'
        option disassoc_low_ack '1'
        option wpa_disable_eapol_key_retries '1'
        option wps_pushbutton '0'

(miwifi mini, 5GHz, mt76)
Can anybody confirm this?