Combobox Popup gets corrupted

User has an Custom Combobox which declares its own popup.

If the Combobox model is presented in the popup, combobox is cleared, re-presented and then combobox is clicked the popup will get corrupted and it will not show anymore content correctly.

Example project with instructions is attached.

Current workaround has been to intercept the events from mouse and keyboard with by adding following code to the Combobox:

MouseArea {
anchors.fill: parent
enabled: (!model || (model.length === 0))
propagateComposedEvents: false
Rectangle { anchors.fill: parent; color: transparentColor }
}