Apple - Why are my app settings not appearing in the Settings app?

I experienced this issue for the first time this morning, on iOS 10.3. To fix, I simply opened multitasking view (double-click Home), and ejected the Settings app. Upon reopening it, app settings returned beneath TV Provider.

I’m quite surprised at the number of bugs with the Settings app since iOS 10 (another would be the disappearing navigation arrow in the upper-left).