Anybody got March 19 security update for Galaxy S8? If yes,anything got new which has missing in One UI update?

Feeling little bit difficulties for switching one app to another through multi tasking button Battery drains are very quicker than beforeOne tapped mode for answering and ending calls are missed   Hope's Samsung will fix these issues 

is anybody feels lagging while wake up screens and turnd off screen?

anybody has felt abnormal battery draining after October security patch updation?