I run a light, all-day schedule that only blocks a few distracting apps, and sometimes add a stricter schedule inside it (e.g. 12–16). The stricter one takes over, but when it ends, the all-day one doesn't come back, so I have to add another schedule just to restart it.

Tested on Android: 1:21–1:27 with 1:22–1:24 inside, and at 1:24 the first one didn't resume.

Idea: when a schedule ends inside another one's window, go back to that one.