Then I figured out that the cleanup step I introduced would never get active since the if condition was written the wrong way.
https://github.com/OoliteProject/oolite ... l.yml#L275
Obviously I corrected that mistake, which triggered the next build as planned. But then something happened that I did not foresee. Here is a screenshot of the log output:

Despite the cleanup step to be configured for removing old prereleases, it decided to delete releases. I do not understand why it did, and I can no longer find ouy why it did so since these builds are no longer available. They are deleted.
1) I deactivated the build step again. No more deletions will be carried out
2) I will need help restoring these versions
3) I will need help to understand why some of the versions still seem to be online. Were they deleted or were they not? How come only some are missing?
This definitely needs to be clarified before I'd activate automatic deletions again.
I am sorry for the inconvenience and happy for any support.