Microsoft.AspNetCore.Components.CustomElements build error

[philipmorley]

The version 9.0.7 Microsoft.AspNetCore.Components.CustomElements gives build errors:

Build:No inputs were found in config file 'C:/Users/PhilipMorley/.nuget/packages/microsoft.aspnetcore.components.customelements/9.0.7/contentFiles/any/net9.0/js/tsconfig.json'. Specified 'include' paths were '["**/*"]' and 'exclude' paths were '[]'.

Build:Cannot read file 'C:/Users/PhilipMorley/.nuget/packages/microsoft.aspnetcore.components.customelements/9.0.7/contentFiles/Shared.JS/tsconfig.json'.

And I cannot find any documentation on how to fix this. I get this error both Blazor Server and Blazor Web Assembly, see repos:

https://github.com/philipmorley/BlazorServer/tree/feature/custom-elements
https://github.com/philipmorley/BlazorWebAssembly/tree/feature/custom-elements

If I downgrade to the version 8 Microsoft.AspNetCore.Components.CustomElements package I do not get this error.

Is this a bug? If not, what do I need to do to make my code work?