I've alerted this but note certain situations lets apps still run. I'm not able to reproduce it. Also note minimizing the app =/= closing the app. They're different, you must use the recents screen.
Apps have to go out of their way and have a prominent notification / remain a foreground service and that stops it. Apps and foreground services can also re-start other apps (that's why the disable feature exists)
Anyways CCing so everyone else can see: nostr:nprofile1qqs9g69ua6m5ec6ukstnmnyewj7a4j0gjjn5hu75f7w23d64gczunmgpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43qz9thwden5te0v35hgar09ec82c30wfjkcctexf34p3