I don't know where to submit bug reports and therefore decided to publish it here. If someone knows where bug reports are to be submitted please feel free to redirect me. In the meantime, this might save some time to some of you.
We have a problem with the last firmware (RUT2_R_00.07.02 | 2022.05.23) when the device boots up, it somehow can't establish the wireguard connection that we configured. To force it to start wg0, we need to ssh on the device and issue the following command:
Then the connection works without problem. i.e. it is not a configuration issue...
For the moment we keep to the RUT2_R_00.07.01.4 | 2022.02.25, which works flawlessly.