Silence at night - on aarch64?

right, I have this “problem” where setting ringtone to 0%
manually via UI I cannot use (systemd -timed) script to unsilence (see below)

(this is related as I use it to silence at 22:00 and then unsilence at 07:00
(which does not work if manually set to 0%) – I hoped this could make a difference but naturally it doesn’t ;/ – the workaround is to “silence” carefully just to 20%)