I have an app which always runs on the source computer (under Qt creator), and most of the time runs on other macs. When it fails on the other computer (which at the moment is always), the crash report says "Library not loaded: @rpath/QtPrintSupport.framework..."
QtPrintSupport is in the app's Frameworks directory.

I am NOT a Qt expert.
I am using macdeployqt, and usually successfully.
My qt.conf looks like this
Plugins = PlugIns
Imports = Resources/qml
Qml2Imports = Resources/qml