On my side, it is approach procedure that is never generated as it is on my original route created with Navigraph and copied/pasted in Simbrief. SID and STAR are OK but the generated route from there never includes RNAV or ILS approches even if I can see the Approach Code pasted along with destination Airport and of course I’ve chose “Detailed Navlog”.
That said, Navigraph Copy/Paste function has some flaws too but it’s another question.
SimBrief does not include approach procedures, only the SID, STAR, and route. This is why normally it is recommended to plan your flight in SimBrief first, then import into Charts to select an approach, etc.