dropEvent not firing in PyQt5

I'm trying to implement Drag&Drop in my application, but the dropEvent in the target widget is never called.

I searched this problem a lot but every solution I found involves overriding dragMoveEvent, which I did, but with no difference.

This example code for me is not working either, for the above reason:

Main window class:

class Win(QtWidgets.QWidget):
    def __init__(self):
        super(Win, self).__init__()
        self.setGeometry(200, 300, 400, 200)
        self.setLayout(QtWidgets.QHBoxLayout())
        self.layout().addWidget(DragLabel())
        self.layout().addWidget(DropTest())

Label to drag:

class DragLabel(QtWidgets.QLabel):
    def __init__(self):
        super(DragLabel, self).__init__()
        self.setText("Drag me")

    def mouseMoveEvent(self, e):
        if e.buttons() != QtCore.Qt.LeftButton:
            return

        mimeData = QtCore.QMimeData()
        mimeData.setText("Test drop")

        drag = QtGui.QDrag(self)
        drag.setMimeData(mimeData)

        dropAction = drag.exec(QtCore.Qt.CopyAction)

Widget to drop onto:

class DropTest(QtWidgets.QWidget):
    def __init__(self):
        super(DropTest, self).__init__()
        self.setAcceptDrops(True)

    def dragEnterEvent(self, e):
        print("DragEnter")
        e.accept()

    def dragMoveEvent(self, e):
        print("DragMove")
        e.accept()

    def dropEvent(self, e):
        print("DropEvent")
        position = e.pos()
        print(position)
        e.accept()

When I drag the label onto the other widget I see that both dragEnterEvent and dragMoveEvent are being called, but when I actually drop the label I get no message from the dropEvent function.

Plus, after closing the window the application will hang and won't quit.

I'm using PyQt 5.13.1 x86_64 installed with DNF in Fedora 31. Python version is 3.7.5 with no virtualenv.

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