Issue to turn off ambient lighting on VMBEL4 at sunrise on Sunday

Dear all,

I have installed 2 weeks ago my first VMBEL4, to replace an older OLED glass panel.
I have set ambient lighting (up and down LED) to start at sunset and to stop at sunrise, every day of the week.
For the second week (all Sundays since the new device is there actually), the LEDs do not turn off at sunrise on Sunday.
In the program in the VMBEL4, the program step is well set to turn off at sunrise on “every day of the week” and not on “every day of the week except Sunday”. I don’t understand why the LEDs are not turning off…
Am I doing something wrong or is it a (known?) bug?
Thank you