Skywatcher films strange rectangular shaped sky anomaly

While observing the sky with a Bushnell Equinox Z 6×50 mm digital night vision a skywatcher noticed a strange rectangular shaped cloud formation in the night sky over Groenlo, the Netherlands.

The skywatcher wonders whether it could be a chemtrail or something else because there were no other clouds except that one.

 Instead of a chemtrail, could it be a cloaked UFO that moves very slowly through the night sky?

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