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. When a package reaches the Release Candidate state, Unity guarantees that it will transition to the Released state during the next stage of the release cycle (either TECH or LTS).
Packages that are Release Candidates appear in the list of Released packages, but the Package Manager displays the label in the details pane and the label in the list pane until they fully transition to the Released state.
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.