The current implementation for bridge based interfaces has an issue which is caused by priority inheritance.
We always assumed that the bridge interface will be created last, but this may not be true in all cases where some interfaces will be created "on demand" - e.g. OpenVPN or late (VXLAN, GENEVE)
As we already have a bunch of verify steps in place we should not see a bridge interface leak to the underlaying infrastructure code. This means, whenever an interface will be member of a bridge, and the bridge does yet not exist, we will create it in advance in the interface context, as the bridge code will be run in the same commit but maybe sooner or later.
This will also be the solution for T2924