Or a bug in an unstable feature, which will stick around for a full stable cycle even if it's been fixed in nightly, because people are not necessarily paying attention to whether a given unstable feature remains functional in a stable release. Any given nightly feature can be broken in any given nightly, and fixed in a subsequent nightly; if that happens to be the point at which beta branches from, the feature will stay broken, and there's no particular reason to backport a fix for it.
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