Does the light actually turn on and just the control panel it is not updated?
If the light do not turn on at all, try increasing the delay in the Automation->Scenes->GroupsOn program:
Modules
.InGroup( PROGRAM_OPTIONS_STRING )
.OfDeviceType("Light,Dimmer")
.IterationDelay(0.25) // <--- 250ms pause, try increasing it to eg. 350ms (0.35)
.On();
If the light turn on and just the status in the control panel it is not updated, try to look at the debug info in the browser console and see if the event is missing from there.
g.