The help window for the “Latest” column when creating a release shows:
“The most recent, non-pre-release package that we could find in the NuGet feed.”
However, if the highest number package available is a pre-release package, then it shows the pre-release as the latest.
Also, when clicking the search button, it defaults to having pre-release as checked, which I feel it should be defaulted as unchecked. (Though this isn’t technically part of the bug, just a preference. I feel you should have to opt-in for a pre-release, essentially, instead of having to opt-out.)
If I uncheck the box and filter, it correctly does not show the latest package if it is a pre-release.
I have opened a Github Issue for this: https://github.com/OctopusDeploy/Issues/issues/1397