I’m sure you know that’s not what I mean.
Bugs are bugs, but the intended service is another matter.
Compare it to something like Netflix, for example. One week you watch a series; the next week you find it is no longer available.
Or if thinking about gaming, Timewalking dungeons in World of Warcraft.
Timewalking is a World Event and each of the Timewalking expansions is available in a weekly rotation with the other World Events. Each World Event is available for a week before the next event in the rotation becomes available. Check your in-game Calendar to see when Timewalking will be up.
Curated content happens of lots on platforms and services.