I have 3 Dolphin windows, two of which have split panes and the
third
of which has a terminal pane. Under X11 after logging in I can get all
3 windows, but the terminal is either open or closed in all three. The
split ones are still split. See:
https://bugs.kde.org/show_bug.cgi?id=455324
Under Wayland, nothing works. This is partly (I think) because
KDE/Plasma session restore on Wayland is simply broken. This has been
reported multiple times and is logged as needing attention. It's the
main reason I haven't switched to Wayland. See:
https://bugs.kde.org/show_bug.cgi?id=436318
poc
That is also the same reason why I have not yet changed to Wayland.
I also read Nate Graham's blog: