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Bug
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    Resolution: Done
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P1: Critical
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    None
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    5.12.4
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    macOS 10.15 beta (19A546d)
 
Looks like Catalina breaks QtQuick rendering.
The window content will not be updated until forced by e.g. a window resize.
Just try to input text in the following example:
import QtQuick 2.12 import QtQuick.Window 2.12 Window { visible: true width: 640 height: 480 title: qsTr("Hello World") TextEdit { anchors.centerIn: parent width: 300 text: "Hello" } }