KDE: okular, dolphin, kate and other app don't restore after reboot

[s2s <s2s@lavabit.com>]

Hi,

I have saved my session manually but since last upgrade plasma was 
updated and it doesn't restore the tab any more after a reboot. what 
setting should i check ?

Debian/Sid

Operating System: Debian GNU/Linux
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.14.0-1-amd64 (64-bit)
Graphics Platform: X11