I don't deal much with Japanese stuff, but most of their stuff had real laminated glass in their panels. Laminated glass generally shatters when hit by a round or splinter. Either can penetrate but the panel generally stays intact owing to the lamination. Based upon my experience with US aircraft from WWII, synthetic glass sometimes allows a hole and remains intact and sometimes shatters. It seems to depend on the impact angle and what actually hit it. Also, the surrounding frame and it's ability to absorb impact energy is also a factor.
Hope that helps.