In nearly all of my interviews, as soon as I mentioned wishing to work 30 hours (because I want to have time to sharpen my skills in my other 10 hours, which I always sold as a positive feedback loop which helps me be more knowlegable at work), the HR admin/recruiter would go all deer in the headlights, promise to check and get back to me and promptly ghost me.
Luckily I found a place where the CTO appreciated my reasoning. I am just wondering whether my approach was incorrect or whether reduced hours is just really unheard of where I am (southern EU)