Recent update for KDE Neon 6.2 User Edition seems to require removal of (among others) Qt6 development libraries, that I had installed (from NEON User repo) before the update:
qt6-base-dev-tools
qt6-base-dev
qt6-svg-dev
It seems to resolve the issue. Neither sudo apt dist-upgrade nor pkcon update wants to remove ‘qt6-*’ packages anymore, as a dependency/requirement for “*wayland*” packages upgrade.
Strange…