There is an invisible MouseArea in the virtual keyboard that covers the entire screen, and overlapping all the other quickitem. The height of the MouseArea been set as keyboard.ScreenHeight in the keyboard.qml

Due to this the MouseArea is overlapping with other quickitem , and application logic to handle multi-touch scenario (for overlapping quickitems) failed.

https://code.qt.io/cgit/qt/qtvirtualkeyboard.git/tree/src/components/Keyboard.qml#n1312

MouseArea {
anchors.left: parent.left
anchors.right: parent.right
anchors.bottom: parent.bottom
height: keyboard.screenHeight
onPressed: keyboard.hideWordCandidateContextMenu()
enabled: wordCandidateContextMenuList.enabled
} 

 
To get the word candidate context menu visible, enable Hunspell, type some text and long press on a word candidate.