In the alpha and beta versions of the Editor, Pre-release packages will transition to the “Release Candidate” state if they are strong candidates for official release. Although the label still appears in the Package Manager window during this transition time, you can find it in the list of released packages, even when the Enable Pre-release Packages project setting is disabled.
For a list of stable packages, including both release candidates and packages that are officially released for this version, see Released packages.
For more information about package states, see Package states and lifecycle.