ubuntu/ath10k: regdomain has no effect

Summary: PCEngines APU2 board with 2 identical Compex WLE600VX wireless cards. Ubuntu 22.04 with 5.19 (hwe) kernel. I'm trying to make them work as an access points using hostapd, usual way. Both cards come with US (0x0) regdomain in EEPROM, so it should work fine (in world regdomain all channels are marked as No-IR -> no AP for ya):

# dmesg | grep regdomain
[   22.933786] ath: EEPROM regdomain: 0x0
[   23.093868] ath: EEPROM regdomain: 0x0

Problem is I can't set the regdomain for the 1st card:

# iw reg get
global
country 98: DFS-UNSET
        (902 - 904 @ 2), (N/A, 20), (N/A), PASSIVE-SCAN
        (904 - 920 @ 2), (N/A, 20), (N/A), PASSIVE-SCAN
        (920 - 928 @ 2), (N/A, 20), (N/A), PASSIVE-SCAN
        (2402 - 2472 @ 40), (N/A, 20), (N/A)
        (2457 - 2472 @ 15), (N/A, 20), (N/A), PASSIVE-SCAN
        (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
        (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
        (5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
        (5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
        (57240 - 63720 @ 2160), (N/A, 0), (N/A)

phy#1
country US: DFS-FCC
        (902 - 904 @ 2), (N/A, 30), (N/A)
        (904 - 920 @ 16), (N/A, 30), (N/A)
        (920 - 928 @ 8), (N/A, 30), (N/A)
        (2400 - 2472 @ 40), (N/A, 30), (N/A)
        (5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
        (5250 - 5350 @ 80), (N/A, 24), (0 ms), DFS, AUTO-BW
        (5470 - 5730 @ 160), (N/A, 24), (0 ms), DFS
        (5730 - 5850 @ 80), (N/A, 30), (N/A), AUTO-BW
        (5850 - 5895 @ 40), (N/A, 27), (N/A), NO-OUTDOOR, AUTO-BW, PASSIVE-SCAN
        (5925 - 7125 @ 320), (N/A, 12), (N/A), NO-OUTDOOR, PASSIVE-SCAN
        (57240 - 71000 @ 2160), (N/A, 40), (N/A)

phy#0
country 99: DFS-UNSET
        (2402 - 2472 @ 40), (N/A, 20), (N/A)
        (5140 - 5360 @ 80), (N/A, 30), (N/A), PASSIVE-SCAN
        (5715 - 5860 @ 80), (N/A, 30), (N/A), PASSIVE-SCAN

phy0 always stays 99 even after doing iw reg set US. Consequently I cannot use any 5Ghz frequencies on it in AP mode. Any idea what I miss? The cards are the same, regdomain same, why they are treated differently? I can even swap them in PCI-E slots but the result stays the same. P.S. If I add option ieee80211_regdom=US to module cfg80211 the regdomain is shown as US in iw reg get, but the frequencies are anyway blocked in iw list (marked as No-IR):

Frequencies:
                        * 5180 MHz  (30.0 dBm) (no IR)
                        * 5200 MHz  (30.0 dBm) (no IR)
                        * 5220 MHz  (30.0 dBm) (no IR)
                        * 5240 MHz  (30.0 dBm) (no IR)
                        * 5260 MHz  (30.0 dBm) (no IR, radar detection)
                        * 5280 MHz  (30.0 dBm) (no IR, radar detection)
                        * 5300 MHz  (30.0 dBm) (no IR, radar detection)
                        * 5320 MHz  (30.0 dBm) (no IR, radar detection)
                        * 5500 MHz  (disabled)
                        * 5520 MHz  (disabled)
                        * 5540 MHz  (disabled)
                        * 5560 MHz  (disabled)
                        * 5580 MHz  (disabled)
                        * 5600 MHz  (disabled)
                        * 5620 MHz  (disabled)
                        * 5640 MHz  (disabled)
                        * 5660 MHz  (disabled)
                        * 5680 MHz  (disabled)
                        * 5700 MHz  (disabled)
                        * 5720 MHz  (disabled)
                        * 5745 MHz  (30.0 dBm) (no IR)
                        * 5765 MHz  (30.0 dBm) (no IR)
                        * 5785 MHz  (30.0 dBm) (no IR)
                        * 5805 MHz  (30.0 dBm) (no IR)
                        * 5825 MHz  (30.0 dBm) (no IR)
                        * 5845 MHz  (30.0 dBm) (no IR)
                        * 5865 MHz  (disabled)