Open windows don't remember their position even when told to do so.
STEPS TO REPRODUCE
1. Open an application that supports saving its last position like Konsole
The window size and position is always the same.
Konsole should remember the placing of the window from the last session.
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Graphics platform: Wayland
*** This bug has been marked as a duplicate of bug 15329 ***