No sound on iPhone when using Find My iPhone

Similar to iPhone does not make noise when I ping it… - Apple Community, but I noticed this today after updating to iOS 18.2. I waited and waited, letting the phone vibrate for like 30 seconds and it just stopped vibrating as the Play Sound finished its cycle.

So I tried taking the phone off Silent Mode, and it was even worse: no vibration, no sound. Just the token "Find my phone" alert pop-up. Then I noticed the phone's volume was set to zero. Setting the volume just a notch above zero, and indeed it makes a barely audible beep. Setting the volume to something like 50% and finally I get the sound I'd expect.

This makes no sense to me: if my phone is lost, I can't exactly increase its volume so that I can hear the Find My phone sound.