Cannot block mesh nodes with iw

I set up a 802.11s mesh with multiple devices. Two of them (both Netgear r7800) are also connected by cable. To prevent a loop i wanted to prevent these two devices of connecting as described in the mesh network documentation. But using iw (iw-full is installed) to block the MAC address of the second node i just get the following error message:
iw dev wlan0 station set 00:00:00:00:00:00 plink_action block
command failed: No such file or directory (-2)