Generate nuget package on build package version field not working as expected.

In a netstandard2.0 library project, I have the project set to generate a nuget package on build. I noticed that the "Package version" textbox updates the <Version> tag in the project, instead of the <PackageVersion>. This is the tag which is used to version a nuget package, regardless of what is inside the <Version> tag.

Since the textbox is labeled "Package version" I would expect it to update the <PackageVersion> tag in the project file.

For example lets say a project has
<PackageVersion>1.0.5</PackageVersion>.
Now if I go to the project properties and edit the Package version to 1.0.6, a new tag is added to the project; <Version>1.0.6</Version> and the nuget package builds as version 1.0.5. This is not the behavior I would expect to see.

_This issue has been moved from https://developercommunity.visualstudio.com/content/problem/154724/generate-nuget-package-on-build-package-version-fi.html
VSTS ticketId: 528659_
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