Custom Loading component

I’m trying to write a custom loading component, similar to the built-in dash component. However, in mine, I’d like to ignore when certain elements are loading. When looking at the loading_state prop that is provided, I see is_loading being set to true, but the component_name is an empty string. Is this the expected behavior? If so, why? I would expect that the component down the tree that is currently “loading” would be named in the loading_state['component_name'].