Harmony group lighting broken since 104 changes

I have a number of zwave lights, a lot of which are relay switches & I have emulated_hue running with default configuration.

On MyHarmony, under Home Control, I have 3 buttons mapped to individual switch lights exposed via emulated_hue - these work fine for on (press) and off (long press).

Button 4 was previously mapped to the default group.all_switches and used to switch off all lights when watching a movie at a user selectable right time. I have created a replacement group for this manually added it to Home Assistant, which has added it to emulated_hue, and it then appears as an option in Harmony.
I have created another group with a smaller number of devices in it, which then appears in the MyHarmony configuration, but it does not trigger either on or off commands.

I understand that I can probably bodge around this with creating a fake switch and triggering a script or similar, but it looks to me that all group functions from Harmony via emulated_hue were broken in 104.

Does anyone have any similar experience or ideas before I raise a bug for this?