Publish fails when project contains linked Content

[pke]

Having this directive in my project file makes it unpublishable:

<Content Include="..\shared\cert\sdcb21.pfx">
  <Link>cert/sdcb21.pfx</Link>
</Content>

It does not give a detailed error, just fails.

edit: This seems to be only happening when there is also an entry like this also in the same projects or one of the included projects:

<ItemGroup>
  <Folder Include="cert\" />
</ItemGroup>