Release tag not available

I tagged a new release today — 8.x-1.0-alpha13 — but it is not available to prepare as a release.

https://cgit.drupalcode.org/domain/tree/?id=8.x.1.0-alpha13

https://www.drupal.org/node/add/project-release/99990

Adding a project release only gives me the option of a 5.x branch release.


Source: https://www.drupal.org/project/issues/rss/infrastructure