Thank you, I'm still running into this issue on 7.0.0 with an unclean shutdown.
I've created a user script that runs on array start based on
https://blog.siglerdev.us/unraidos/
using the settings provided above
I can get the network setup, but for some reasons the dockers either don't talk to the host or to the outside world.
I've tried to setup the default gateway on shim-br0 and the routes, but they never seem to work