When the developer creates an extension they specify a category.

Then they create a module and load slicer. Rather than being in the selected category it is in the Example category, so it is unexpected and the developer may think it failed to load.

This is because extensions have a different meaning of category and modules can each have their own category.

By default it would be nice if the new module should be created with the same category as the extension. Or there could be a fields to specify the module category explicitly.