Content files do not get copied

Description

Paket version 5.194.3

I have a NuGet package with a Content folder which contains 1 file. Whatever I try, it is impossible to get this Content file to show up in my project.

Repro steps

Clone https://github.com/Informatievlaanderen/example-registry.git at commit https://github.com/Informatievlaanderen/example-registry/commit/04fb3fe67341aa679d5aed24db4192fd5fcb20e8

https://github.com/Informatievlaanderen/example-registry/blob/04fb3fe67341aa679d5aed24db4192fd5fcb20e8/paket.dependencies#L33 lists nuget Be.Vlaanderen.Basisregisters.Testing.Infrastructure.Events ~> 1.0 content: true, copy_content_to_output_dir: always, copy_local: true (Yes, I tried it all eventually :p)

https://github.com/Informatievlaanderen/example-registry/blob/04fb3fe67341aa679d5aed24db4192fd5fcb20e8/test/ExampleRegistry.Tests/paket.references#L8 references this package

When I run paket install --force nothing gets added to the project:

In the packages folder I can see the package with the Content folder:

Expected behavior

I expect the InfrastructureEventsTest.cs folder to be copied to the folder. Just need the file to be copied, MSBuild (.NET Core) should probably take care of the rest.

Actual behavior

Nothing happens

Known workarounds

No idea.

Reproduce the issue from the linked example-registry commit, checking paket.dependencies and test/ExampleRegistry.Tests/paket.references, then run paket install --force. Trace Paket's handling of NuGet Content files and verify that InfrastructureEventsTest.cs is copied into the project as expected.