Hmm, looks like another bad flash of a R4AG if you followed the openwrt wiki instructions?
https://openwrt.org/inbox/toh/xiaomi/xiaomi_mi_router_4a_gigabit_edition#notes_on_firmware_exploit_procedure
What does Network > Interfaces page look like?
https://forum.openwrt.org/t/xiaomi-4a-router-gigabit-edition-internet-not-working/121192
Restore original Xiaomi firmware and try installation again.
https://openwrt.org/inbox/toh/xiaomi/xiaomi_mi_router_4a_gigabit_edition#debricking
If you use Windows, consider using the instructions at bottom of the wiki page.