Browser window not automatically opened when running project

See https://chat.fhir.org/#narrow/stream/179171-dotnet/topic/Microsoft.20fhir-codegen-cli/near/383004416

When running `dotnet run --project src/FhirCodeGenBlazor/FhirCodeGenBlazor.csproj` in the cloned project folder it won't automatically open a browser window. It is however running on http://localhost:5197 when I type this in the browsers.

This is on Mac with Arc as the default browser.