BPI-R4 kernel 6.14 WiFi interfaces on BE14 not discovered

I have encountered quite a strange issue. I built the 6.14-main branch from @frank-w (GitHub - frank-w/BPI-Router-Linux: Linux kernel 4.14+ for BPI-R2, 5.4+ for R64, 6.1+ for R2Pro and R3). During boot only the 2.4GHz wlan is being populated. Firmware seems to be loaded correctly. Used the same build script as for the 6.12-main branch from the same repo. If I switch back to 6.12 everything is fine. Any ideas of what I’m doing wrong?