[Python] PyQt6 QPushButton:hover not changing background colour

I have written this code in PyQt6:

self.button = QPushButton(parent=self, text='Fetch METAR')
self.button.setStyleSheet("""
QPushButton {
color: white;
background-color: #42baff;
}
QPushButton:hover {
color: white;
background-color: #3ca8e6;
}
""")
self.button.setFixedSize(QSize(400, 60))
self.button.move(QPoint(50, 220))


but for some reason, it doesn't work. The text colour changes, but the background colour of the QPushButton does not change when hovering over it, unless I define any border on QPushButton. When I do, it works normally.

I tried using PyQt5 to see whether it works there and voila, it does, but I want to use PyQt6.

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