I like Ubiquiti stuff overall, but they often annoy me with how they implement things.
The Native VLAN/Network setting on the switches does not work as I expect it to. I expect this to be the same as untagging a port in a VLAN, but it is not exactly that because if I select a VLAN here, it becomes unavailable in the trunk port.
This is what keeps fucking me up every time.
It also doesn't help that I have a separate UniFi Management network and I always forget to set the network override to that VLAN on new devices.
I think the last part breaking when I configure the trunk is that I've been setting the Native VLAN as this Unifi MGMT Network and it breaks the trunk.
There is no global setting for using a specific VLAN for Management, which also doesn't help.