Yes, any PageEdit in KUbuntu 18.04 will be built against Qt 5.9.x. This version is quite old and is borderline for its QtWebEngine support.
In Kubuntu 20.04 should use Qt 5.12.5 or later. Please note Qt 5.12.4 is very very broken from Ubuntu 19.10 and should not be used.
I would try installing a PageEdit compiled against Qt 5.12.5.
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