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One thing to note ... your older Sigil version was compiled against Qt 5.12.2 but you are currently running it with Qt 5.12.6. Would it be easy for you to try with Qt 5.12.2 again to see if the crashes? Or alternatively, upgrade and build a more recent version of Sigil built against that specific version of Qt.
There are also some opengl related Qt environment vars that might impact what you are seeing. Might want to check the Qt website for those.
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