I am not sure if this applies here. The walls are fire partitions for sure, and have a rating of at least 30 minutes (we use a 1-hour UL-U311 for sound). This typically comes into play about the exterior walls and the interior load bearing walls. In VB these supporting construction walls do not have to be fire-rated. The part I was looking for clarity on is the table 1020.1 if it applies to floors, too. Elsewhere in the code they indicate that corridors might need additional fire protection than normal.
Not into structural or similar
But seems like the corridor walls have to be “ supporting construction” to include the floor that supports them.
as in comply with 708.4