Bug - Context menus not refreshing properly on pyqt5.14.x

There is a really nasty bug related to context menu refreshing with
versions 5.14.0, 5.14.1, please take a look:

- On versions 5.13.0, 5.13.1, 5.13.2 there is NO bug, demo here
<https://dl.dropboxusercontent.com/s/0q29e06om06an2i/2020-03-31_16-51-23.mp4>
- On versions 5.14.0, 5.14.1 there IS a bug, demo here
<https://dl.dropboxusercontent.com/s/qjg38hy4cxy4ukp/2020-03-31_16-55-00.mp4>

Mcve below:

from PyQt5.Qt import *

if __name__ == '__main__':
    app = QApplication([])

    x = QTreeWidget()
    x.setContextMenuPolicy(Qt.CustomContextMenu)
    i1 = QTreeWidgetItem(x, ["A"])
    i2 = QTreeWidgetItem(i1, ["bar", "i", "ii"])
    i3 = QTreeWidgetItem(i2, ["baz", "a", "b"])

    def callback(point):
        menu = QMenu()
        menu.addAction("Foo")
        menu.addSeparator()
        menu.addAction("Bar")
        menu.exec_(x.mapToGlobal(point))

    x.customContextMenuRequested.connect(callback)
    x.show()
    app.exec_()

I've tested this on windows7 / python3.6.2.

Could you please confirm/advice? I would really like to upgrade my apps to
>5.14 :/

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