Nested dictionary comprehension python

I’m having trouble understanding nested dictionary comprehensions in Python 3. The result I’m getting from the example below outputs the correct structure without error, but only includes one of the inner key: value pairs. I haven’t found an example of a nested dictionary comprehension like this; Googling “nested dictionary comprehension python” shows legacy examples, non-nested comprehensions, or answers solved using a different approach. I may be using the wrong syntax.