I have exactly the same problem with my wiring.
In your setup, is Shelly overriding the physical switch? What I mean is, do you keep the physical switch on at all times and shelly controls the light bulb?
KidSquid is not using the manual switch, it’s bypassed, but you can and a switch if you choose. Adding a switch and using the “SW” connection on the shelly allows you to control the light both ways.
You will only need to keep the switch on at all times if using the switch to feed power to shelly. Normally you would want power from the breaker to supply both the shelly and the switch. See illustration in post 11. The lighting bolt on bottom right would be power from breaker. Notice it feeds the “I” (input for shelly to operate bulb) and “L” (used to give power to shelly device) terminals and to one side of manual switch. The other side of manual switch is connected to “SW” of shelly. When you turn on manual switch shelly gets input at “SW” terminal and closes the contacts between “I” and “O” (internal set of contacts).
Hope this helps.
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