The problem is setCentralWidget own part->widget, i don't understaind why widget got deleted but it's cause a part to delete itselfis is internal change in Qt 5.9 i think. The reflect in dangling pointers in framemanager and actionmanagerCall winId before setCentralWidget creates a temporary widget then it owns a setted one.
BUG: 381822
BUG: 378513
BUG: 381825
BUG: 377129