Xiaomi 4a router (gigabit edition) Internet not working

I have one flat network. No VLANs. I do use wireless bridges (Padavan)

UPDATE:

This is the same as my issue.
https://forum.openwrt.org/t/xiaomi-r4a-gigabit-21-02-problem-with-100mbps-ethernet-wan/107985

OEM firmware works 100% every time with the following 100mb switches:
Netgear FSM726 antique 24x100mb + 2x1Gb ports managed switch
TPlink TL-SF1008D v9 - 8x 100mb port unmanaged
TPlink TL-SF1005D v10.1 - 5x 100mb port unmanaged

21.02.2
Netgear FSM726 antique managed switch - some times but not always fails on 100mb ports when R4AG power cycled. Port status light on switch flashes when it should be constant. Works OK wired to the spare gigabit port on FSM726.
TPlink TL-SF1008D v9 - 8x 100mb port unmanaged - fails Everytime when R4AG power cycled.
TPlink TL-SF1005D v10.1 - 5x 100mb port unmanaged - 100% OK

Both TPlinks removed from their usual locations and currently wired into 100mb ports of the FMS726 during this investigation.