Besides the Winbond NAND chip, there is also an AN8855 switch that is not currently officially supported in Snapshots (see red warning messages in the Wiki).
This is because you flashed a Snapshot that does not have driver for the AN8855 switch.
restore stock firmware:
https://openwrt.org/inbox/toh/xiaomi/ax3000t#tftp_instructions_for_the_stock_bootloader
Or use official Xiaomi MiWiFi recovery tool Xiaomi Mi Router 4A Gigabit Edition (R4AG/R4A Gigabit) -- fully supported and flashable with OpenWRTInvasion - #747 by Zorro
- you can find stock firmware image for your AX3000T RD03 in the wiki (see "Stock Firmware URL").