Kindly complaint to Samsung customer care support through Samsung Members App as a error report also send log files along with this error report for this issue and wait for next update it's maybe fix it by Samsung team soon. If you like Please accept it's as a solution it's help to others users also,click on 3dots in my reply section and click on accept solution. Thanks.
First is samsung have not app lock but secure folder is good, now secure folder not secure, new update remove the "lock secure folder when leaving app", so also see in background, if samsung not fix this probem then, it becomes downfall for samsung .
