Bridge interfaces with the same name on different machines now generate the same MAC address for the bridge. I use a bridge on several manjaro machines on the network so that I can use QEMU+TAP to allow my QEMU/KVM virtual machines to be on the ethernet network as if they are regular machines. I have used this setup for several years.
This changed after this updating to the 2019-02-19 stable update.
My setup is using the Network Manager UI, I edit connection create a bridge network using the wired network interface as slave and I name the bridge interface br0. The adapter comes up and is assigned an address via DHCP like normal. But the other machines on the network configured similarly with a bridge interface named br0 are now using the same MAC address instead of a random (which is how they used to work). ANd therefore step on each other on the network.
Only if I change the name of the bridge interface does it get a different a different MAC. So if i change the name to br1, I get a different MAC, but another machine on the network with a bridge interface named br1 will have the same MAC.
This happens whether I create the bridge network using Network Manager, NetCtl, or create the interface in systemd.