Opening applications with macOS docker toolchain takes really long

When trying to open B2Qt macOS docker toolchain applications, opening the applications takes really long. The spinner in the Projects window is spinning for minutes and if one checks with 'top' 'apple.com.Virtualization.VirtualMachine' is hogging 300% of CPU. Eventually the applications open, build and gets deployed to the B2Qt devices, but for example opening addressbook shows in Issues tab:

/Users/qt/RTA/B2Qt_6.6.0/Examples/Qt-6.6.0/widgets/itemviews/addressbook/main.cpp:4: error: In included file: 'QWidget' file not found
/Users/qt/RTA/B2Qt_6.6.0/Examples/Qt-6.6.0/widgets/itemviews/addressbook/main.cpp:11: error: Unknown type name 'QApplication'
/Users/qt/RTA/B2Qt_6.6.0/Examples/Qt-6.6.0/widgets/itemviews/addressbook/main.cpp:13: error: No member named 'show' in 'MainWindow'

The application builds and gets deployed nevertheless.