I got the same problem, but I have found a workaround.
The Shelly Plus Uni is used to control my BOSCH garage door lift.
To avoid this bug, I selected in the Shelly Binding the Shelly Plus i4 and configured it with the IP address of the the Shelly Plus Uni in my network. With this configuration, the Plus Uni was found by the Shelly Binding and was added as a Thing.
This Shelly Plus i4 Thing shows me the correct channels of the Shelly Plus Uni (2 Inputs, 2 Outputs) and I can read the inputs and control the outputs via OpenHAB.
In my case this is working.
Thanks for the workaround using Shell Plus I4.Basically this is working partially.
For my need’s it is not working as I’ relay on the counter input (input:2) of the Shelly plus uny. this input type “counter” is not supported by I4. May be the workaround would work with some other plus device that has a counter input.
Just to do some visualization I’ can go with a work around but for the final integration I’ll need the Functionality of the Shelly Plus Uni.
Thank you for the workaround it is an option useful for others I’ guess.