Intellisense does not show module-private functions

Inside of my script modules I don't use the naming convention "verb-noun" for the functions which are private and are used only inside the modules and therefore I don't expose. Tipically I put these functions in a nested module.

Intellisense is unable to suggest these functions if I try to call them from the parent module or others nested modules, also Peek Definition and Find All Reference don't give me any results.
Instead Peek Definition and Fin All Reference work properly if I'm in the module where the function is defined, while Intellisens works partially, it suggest me the funtion but don't show the extendend information.

If the functions follow the "verb-noun" naming convention Intellisense, Peek Definition and Find All Reference work fine, no matter where they are defined and where I try to call them