[Python] Why does PyQt6 leave large gap between dock widgets after docking them?

I'm using qtpy (wrapping PyQt6) and have a window with dock widgets like so:



However, when I drag and re-dock a dock widget, for some unknown reason the widget redocks with a huge gap between the other dock widget (as indicated by the arrow below):



Any ideas how to avoid this gap? I wonder if it's a Qt6 issue as I don't recall seeing this behaviour in Qt4 or Qt5.

The full minimal working example is below:

import sys

from qtpy.QtCore import Qt
from qtpy.QtWidgets import QApplication, QMainWindow, QDockWidget, QTextEdit, QComboBox


class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.resize(800, 600)

central_widget = QTextEdit("Main content area")
self.setCentralWidget(central_widget)

dock1 = QDockWidget("Dock 1", self)
dock1.setWidget(QComboBox())
dock1.setAllowedAreas(Qt.RightDockWidgetArea)
dock1.setMinimumWidth(200)

dock2 = QDockWidget("Dock 2", self)
dock2.setWidget(QComboBox())
dock2.setAllowedAreas(Qt.RightDockWidgetArea)
dock1.setMinimumWidth(200)

self.addDockWidget(Qt.RightDockWidgetArea, dock1)
self.addDockWidget(Qt.RightDockWidgetArea, dock2)
self.setDockOptions(QMainWindow.AnimatedDocks)


if __name__ == "__main__":
app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()

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