MT6000 main UI "not found" -- no recent flashing

This is MT6000, Flint 2

There is "not found" where there is usually the prompt to login. Only luci is functional. Luci has a persistent red error banner " ReferenceError View is not defined"

firmware version from luci overview
OpenWrt 21.02-SNAPSHOT r15812+1075-46b6ee7ffc / LuCI openwrt-21.02 branch git-22.335.71649-0ecaf74

I use this as AP router with mandatory WireGuard client. I do not auto update. It still has the shipping firmware.

It does provide vpn to AP clients via WireGuard and gets internets from the ISP device.

Should I flash current firmware from luci > system > flash? I have logs from luci but I will not publish them in the clear.

Did you run any commands by SSH or updated plugins?