There's a closed pull request on the void-packages repository

plasma-workspace: dependencies fixed
https://github.com/void-linux/void-packages/pull/15826

Description:
Without these dependencies, the wayland plasma session will not work.
Without _xorg-server-xwayland_ will return to DM.
Without _qt5-wayland_ there will be just a black screen.
Without these two packages will return in DM.