IDISP007 issue only on build

[ryanbuening]

Thanks for this great tool! I have a Blazor application (using .NET 7.0.304) with a code-behind C# file that implements IDisposable

public partial class UnassignedClaims : IDisposable
{ 
	private GoogleMap _map = new();
  ...
	public void Dispose()
	{
		_map.Dispose();
	}
}

GoogleMap looks like the following

namespace GoogleMapsComponents
{
	public class GoogleMap : MapComponent, IDisposable
	{
		void IDisposable.Dispose()
		{
		}
	}
}

I have <TreatWarningsAsErrors>true</TreatWarningsAsErrors> set. There are not any warnings/errors shown in the error list in VS. However, when I go to build, I receive a failed build with:

error IDISP007: Don't dispose injected on _map.Dispose();

1. Why shouldn't I dispose here?
2. Why doesn't VS report an issue? I only see this issue after building.