Mhh, I would have thought the problem was general on linux or at least on bridges. Perhaps it is arch (ARM) or kernel-version dependent?
Or, there is some idiosyncrasy in my bridges setups. I don’t believe this but here is a failing one on ARM:
auto lanbr
iface lanbr inet dhcp
bridge-stp on
bridge-maxwait 2
bridge-fd 2
bridge-ports eth0 usb0