mystery solved:
"libqt5gui5" used to only *suggest* "qtwayland5", and suggestions don't get automatically installed.
As of libqt5gui5_5.15.6+dfsg-5 (uploaded to Debian on 2022-12-03), this soft dependency has been promoted to "Recommends".
therefore: this is fixed in Ubuntu/23.04 (lunar)
mystery solved:
"libqt5gui5" used to only *suggest* "qtwayland5", and suggestions don't get automatically installed.
As of libqt5gui5_ 5.15.6+ dfsg-5 (uploaded to Debian on 2022-12-03), this soft dependency has been promoted to "Recommends".
therefore: this is fixed in Ubuntu/23.04 (lunar)