Sitecom WLR-4100 does not work in Master branch

I was able to add Sitecom WLR-4100 on 19.07 but it does not work in master branch.
LAN data is correctly received by QCA8337 and it is forwarded to MT7620A, but no Ethernet data is generated by MT7620A.
Did anybody tested the MT7620A + external switch router in Master branch?