The same is for new nuget V3 API.
Steps to reproduce:

1. Unlist all versions of package in proget UI
2. List only one version / push new version

Expected result:
Visual Studio UI shows only one version which was listed

Observed result:
Visual Studio UI shows all the versions

accidentally forked from https://forums.inedo.com/topic/2841/proget-return-unlisted-packages-in-visual-studio/5

--

@atripp Hello.
I have got the same behaviour too.
With fiddler i see that all versions i unlisted before have property
<d:Listed m:type="Edm.Boolean">false</d:Listed>
, but still apeear in VisualStudio, nuget list and even Rider.
Version - 5.3.0 (Build 126-5.3.0).

I think this one is related:
https://forums.inedo.com/topic/2675/owner-has-unlisted-the-package-on-nuget-org-but-proget-still-shows-it-in-the-list-of-availible-versions/4

Updated to 5.3.0 (Build 126-5.3.0) V2 API's behavour is the same.

@thoven looks like it's a regression on 5.2.30 (Build 4).
VisualStudio shows unlisted packages, nuget api returns <updated>1900-01-01T00:00:00Z</updated>, but does not return <published>1900-01-01T00:00:00Z</published> as it must do, according to issue description