This is happening on 1 out of 3 KDE 6 laptops.
On my laptop screen, top left corner I keep the Welcome.
On my external monitor, top left corner I keep about this system.
I have 6 desktops with #1 running Nightly, #3 running the current version of Firefox, and #4 running Waterfox. Also there is 1 window of Dolphin, Spectacle (my fav), and settings showing on all desktops.
After rebooting and login, only Welcome is there. All other app are not open. I always have "On login, launch apps that were open: On last logout set.
Operating System: openSUSE Tumbleweed 20240607
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1
Kernel Version: 6.9.3-1-default (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5825U with Radeon Graphics
Memory: 62.1 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: HP ProBook 455 15.6 inch G9 Notebook PC