dotnet format inserts invalid cast to delegate in moq code

Given the following code

```
private static Mock CreateAugmentationBuilderWorkflow(string workflow, IList builders)
{
var augmentationBuilderWorkflowsMock = new Mock();
var workflows = new Dictionary();
var workflowMock = new Mock();
workflowMock.Setup(x => x.Name).Returns(workflow);
workflowMock.Setup(x => x.Builders).Returns(builders);
workflows.Add(workflow, workflowMock.Object);
augmentationBuilderWorkflowsMock.Setup(x => x.Workflows).Returns(workflows);
return augmentationBuilderWorkflowsMock;
}
```

dotnet format inserts the following cast from `Dictionary` to `Delegate`:
```
workflowMock.Setup(x => x.Builders).Returns((Delegate)builders);
```

I encountered this while ordering the using statements on > 6k files. This happened on about 8 files, which I found through `git diff -G Delegate` after unit tests on my build failed.