802.11r Fast Transition how to understand that FT works?

I used to have the exact same problem, then out of the blue--or most likely, a config change that I don't remember--they were gone.

I have 5 iPhones (X, XR, 11) regularly in my network of 6 Linksys E8450 running master from dec/2021 (7e89421a7c). I turned 802.11r on January 7, and have been running smoothly ever since.
I use WPA3/SAE, and have 802.11{w,r,k,v} on. DAWN fills up neighbor reports (don't know if that helps with FT). Perhaps ft_psk_generate_local 0 may make a difference. Here's my full config:

config wifi-iface 'Xxx_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid 'Xxx'
        option encryption 'sae'
        option key '***'
        option ieee80211w '2'
        option ieee80211r '1'
        option ft_psk_generate_local '0'
        option ft_over_ds '0'
        option ieee80211k '1'
        option bss_transition '1'
        option ieee80211v '1'
        option disassoc_low_ack '0'

I don't have r0kh or r1kh set because I'm running my patch to compute them from psk. You may want to set them manually.

I also run a legacy SSID with WPA2-PSK, but I don't think I have Apple devices connected to it regularly. It has ft_psk_generate_local '1', and ieee80211w '1', but I can't say if it works or not.