I’m pretty new to zigbee, but the map works with z2m for me with skyconnect and about 15 devices. Doesn’t necessarily help you, but the combination in at least some setups works.
For me rendering the map started to be very slow (longer than the 1-2 minutes announced in the ui) as soon as more than a couple of devices were connected. Maybe some timeout?
Maybe. Because Skyconnect considered beta from Z2M perspective, I decided to replace it with a Sonoff coordinator. I hope it will perform better for both issues. Skyconnect is perfect for ZHA (obviously :)), but it seems it is not as good for Z2M