Thank you KevinH for your very fast answer.
I builded it myself from the zip-file from the PageEdit-page on both (working and non-working) systems
The version of Qt5 and Qt5Webengine is 5.12.8. on the non-working system and 5.9.5 on the working system.
I have really no idea how i can downgrade to an older Qt-version.
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