Hyprland - Window module doesn't change to fullscreen style if a stacked window group is maximized

[izmyname]

My window module is configured in the way, it changes colours if a focused window is on fullscreen. It works, as expected, for single windows, but not for stacked window groups.

To illustrate, here are the screenshots

1. default window module style - no fullscreen
2. fullscreen a single window
3. A stacked group is on the fullscreen, but the window module style didn't change.