Only "solution" I found was to buy a single M5 and put beta 1.6.1 on it https://community.tp-link.com/us/home/forum/topic/274630 Set it up as the master AP and disable "Smart" DHCP. Not really a good...

@ArcoW Same here. I only found this after buying. :( https://community.tp-link.com/en/home/forum/topic/181548?page=1

@Blueman2 See post 18 23/10/2020. https://community.tp-link.com/en/home/forum/topic/222270?page=2

@Blueman2 lol TP Link bearing with us.... This issue was raised in Feb 2019. They promised it'd be fixed in 1.6.0 announced in October 2020. I think we've been more than patient bearing with TP Link....

@TP-Link what's the update on the firmware - it's now March? ... 2021 if you need reminding.

I found a solution for this....