Light Group in stack card - double tap issue

Hi All.
I am new to HA and have started to work on my 1st dashboard…

I created a KITCHEN stackcard using Mushroom Vertical Stack that includes Mushroom Light cards & a Bubble card separator. I configured the double tap on the light cards to bring the lights to 100%, the single tap is set to toggle the lights…
I also created a group (in the helpers section) for all the kitchen lights.

My issue, when the “all kitchen light” group exists, the doubble tap action of each individual light in the stack card does not work (nothing happens) but the double tap action of the group light is OK. If I delete the group of kitchen lights, the double tap action of the individual lights in the kitchen stack card works.

Is this by design ?
Should I just name each entity to be controlled by my “master kitchen switch” instead of creating a group with those individual lights ?
From reading various posts, I thought the group was better/faster that individual lights ?

Thanks in advance for the help.