[TPS65921] PWRON long press (8sec) function

In TPS65921, is "pressing PWRON for 8 seconds" a switch-off event or restart event?

According to my measurement, pressing PWRON for 8 sec in TPS65921 will only switch off TPS65921.  But in TPS65950, it will restart TPS65850 (NRESPWRON low and high immediately.)

Please help to confirm the above difference is true between TPS65921 & TPS65950.

Thanks!

Antony