Error: All parents must belong to the same VLAN

What am I doing wrong here: both nics are connected to the same VLAN(s), as you can see during commissiong this seems to have been detected. However, creating a bond results in this message:

PS: this machine is newly commissioned, and I have the same issue on a few other hosts of the same hardware (motherboard/nic)

Hi, what version of MAAS are you using?

This is on MAAS: 3.0.0 (installed from snap).

Could you please check regiond.log for errors when you try to perform this action and attach them?