Stuff like the (rolled down) Audio Volume, Clipboard, etc. from the System Tray, or Kicker. Works in a X11 session. Is it a bug or a Wayland issue?
❯ kinfo
Operating System: Arch Linux
KDE Plasma Version: 6.0.90 (and in 6.0.5 as well)
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1
Kernel Version: 6.9.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Neither; this is intentional. The fact that you can move these around on X11 is the bug lol
Wait what!? 
That was my favorite “feature” in Plasma 5, because it offered that unique and amazing flexibility of not covering crucial parts -like the buttons of maximized windows when the panel was at the top- when it was pinned to control for example multiple sources of audio playing. Same for the Media Player! In fact yakuake still offers this great flexibility!
You know what? Quake 2 had a bug which accelerated the speed of a character when constantly jumping forward, this particular bug was never fixed in following releases of the franchise because people found it so good and unique, and Quake 3 became the most influential and successful MP game it was for decades by having that unique “feature” people loved as well, so I think you folks should really consider it letting it live! Please 
!
@ngraham please don’t make me use plasmawindowed org.kde.plasma.volume, plasmawindowed org.kde.plasma.clipboard, etc., for having that flexibility, it’s not that nice 
We could consider it!