Hi,
if you look at the output of dmesg, you will find that one firmware file is missing in current snapshots:
[ 11.775001] mt7915e 0000:01:00.0: HW/SW Version: 0x8a108a10, Build Time: 20240823172725a
[ 11.775001]
[ 11.877200] mt7915e 0000:01:00.0: WM Firmware Version: ____000000, Build Time: 20240823172741
[ 11.957618] mt7915e 0000:01:00.0: WA Firmware Version: DEV_000000, Build Time: 20240823172837
[ 12.121544] mt7915e 0000:01:00.0: eeprom load fail, use default bin
[ 12.127923] mt7915e 0000:01:00.0: Direct firmware load for mediatek/mt7916_eeprom.bin failed with error -2
[ 12.137564] mt7915e 0000:01:00.0: Falling back to sysfs fallback for: mediatek/mt7916_eeprom.bin
[ 12.186005] mt7915e: probe of 0000:01:00.0 failed with error -12
Workaround: You can manually copy the file mt7916_eeprom.bin from an older/working snapshot or from MediaTek's OpenWrt feed website into the directory /lib/firmware/mediatek of a current snapshot.
I have still not figured out which commit (to openwrt or mt76) caused the regression.