I created a group for my living room so I can toggle all the devices into one. I want to create a button to turn them all off and on (mostly for just off) but the button seems to stay is a stuck status:
You can try choosing βsceneβ tile. It gives you a tile with on-off buttons.
I have lights on pure groups and added as tiles; this works just fine, on/off and dimming.
Maybe if you are mixing the group and other lights you need to create a virtual switch and use that as the tile.