I use two virtual desktops and I place several applications on the second desktop. When the session is restored, all windows are placed on the first virtual desktop, even those that I had on the second one.
Steps to Reproduce:
1. Config using two virtual desktops
2. Place, e.g. a Dolphin window on the first virtual desktop and one Dolphin window on the second. Change folder on the second window so as to differentiate between them.
3. Logout and login back again.
The two windows appear on the first virtual desktop.
The second window should appear on the second virtual desktop.
Looks related to https://bugs.kde.org/show_bug.cgi?id=348047
*** Bug 437551 has been marked as a duplicate of this bug. ***
See <https://bugzilla.redhat.com/show_bug.cgi?id=1956916> for some further information of this issue
*** This bug has been marked as a duplicate of bug 442380 ***