This is weird because mine has permanent mac and I would like it to be random on public networks.MAC randomization work. ALWAYS. The current build force-enables it EVERY TIME.
I mean Wifi 802.11ac (link speed up to 433Mbps) for now it only handle N which is 200Mbps, and if router configured to 'AC only' wifi doesn't connect at all.
I did not have this issue on previous android versions