Specific PageBuilder Release Unavailable When Deploying Bundle
Symptoms
When attempting to deploy a bundle with a specific PageBuilder release, the release number appears in the dropdown but is unavailable (grayed out).
Cause
Only one copy of any bundle may be deployed for any release. If a bundle is already deployed, whether promoted or on-deck, the release it was deployed under will remain in the drop-down list but will not be available when attempting to deploy another copy of the same bundle.
Solution
Verify that the bundle has already been deployed under the desired release.