qtbase/cmake produced pkg-config .pc files no longer emit dependencies

To keep it short, Qt6.6.2 gave:

$ pkgconf --modversion --cflags Qt6Widgets
6.6.2
$ pkgconf --cflags Qt6Widgets
-I/usr/include/qt6/QtWidgets -I/usr/include/qt6 -DQT_WIDGETS_LIB -I/usr/include/qt6/QtGui -DQT_GUI_LIB -I/usr/include/qt6/QtCore -DQT_CORE_LIB -I/usr/lib64/qt6/mkspecs/linux-g++

And then with Qt6.6.3 (or 6.7.0):

$ pkgconf --modversion Qt6Widgets
6.6.3
$ pkgconf --cflags Qt6Widgets
-I/usr/include/qt6/QtWidgets -I/usr/include/qt6 -DQT_WIDGETS_LIB

I assume this is not intentional? Same happens for others e.g. --cflags Qt6Gui does not show QtCore include path either.

Was noticed after a bug report to Gentoo about a chromium build failure with the qt6 shim. chromium combines pkgconf's Qt6Core and Qt6Widgets but omits Qt6Gui, which led to an include failure for <QImage> after the include path went missing.