Adding manual Link, can not select desired interfaces

Hello,
v4.0 beta3 for windows.
routeros mode not snmp.
I add a manual link between devices. In settings of the link, I choose one device and chose its interface and apply, then choose the other end from dropdown and choose its interface. But once I click apply, the previous setting i did for remote end is lost. If I go back and set it to correct interface back, the other endpoint loses the config this time.
Am I hitting a bug?

I found out that if I choose eth2 on one side, it automatically chooses eth2 on the other side, but eth2 is not the interface of this link. Can someone at least confirm that this is a bug so i can leave it.

I tried snmp and same problem