Multichannel Z-Wave devices don't show correct values and toggle switches main node as well.
There is a known bug in Homey with setting multichannel Z-Wave association upon pairing the device. You will need to go into the Z-Wave parameters under the main node and first change the association of group 1 from 1.1 to 1 and save it. Then change it back to 1.1 and save it again and the issue is resolved.
Affected all the Shelly Wave that have more inputs or outputs like the Wave 2PM, Wave Pro 2, Wave Pro 2PM, etc..