WiFi6 modes work in recent snapshot (Version SNAPSHOT (r27608-3f98f68573) / Date 2024-09-29T22:04:34.000000Z) on all bands after setting a region.
radio2 (6Ghz) needs manual tweaking because luci and mac80211 seems not to be adapted/udated yet for BE14 card or BE/WiFi7 mode.
-> You need to edit /etc/config/wireless and add in "config wifi-device 'radio2'" section (or whatever your "option path 'soc/11300000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0+2'" section is ;-)):
option band '6g'
option channel 'auto'
option country 'DE'
... where cuntry code may need tweakng depending of the region you select.