Not sure if this is the correct forum or if it should be in the code development forum in consideration of the following;
2012 714.1.2 exception 7 requires the ceiling sheathing to be continuous over all top plates unless the wall is constructed as a load bearing fire-resistance wall of at least the same rating of the horizontal assembly it penetrates.
2015 714.4.2 modified this exception and allows the wall to penetrate the ceiling membrane with a double top plate having the wall sheathed with 5/8″ Type X. This wall is not required to be fire-resistance rated except usual where required by other sections of the code according to the Significant Changes to The 2015 IBC.