I recently installed flatpak and was missing application icons in Plasma menu (the one that pops up when you press super/win key).

I noticed while running flatpak that it noticed that it complained that XDG_DATA_DIRS wasn't set. Looking around for values I added the following line to to my ~/.zprofile (I use TERM=zsh, by the way)

export XDG_DATA_DIRS=/var/lib/flatpak/exports/share:$HOME/.local/share/flatpak/exports/share:$XDG_DATA_DIRS

This would eventually add icons to Plasma menu, but it messes up plasma-wayland real bad. plasma-wayland.desktop wouldn't start or would start "without KWin" (I could see some borderless application windows, no background…). I didn't notice that changing my profile script with the line above would mess up plasma-wayland, so I had to switch to plasma.desktop (using X) and began trying different stuff to get back to wayland. I tried switching sddm→lightdm, debugging each desktop manager, no dice.

For the time being, I removed this magical line, but I'm back to not seeing the icons in plasma menu.

What can/should I do to have flatpak icons and keep using plasma-wayland.desktop?