MouseArea::onDoubleClick works unstable in QT 5.12.5

[Gourmet]

It is simple in my code:
QML:

MouseArea {
                id: tapArea
                z: -1
                anchors.fill: parent
                onDoubleClicked: { modelData.EditedIndex = index; console.warn("doubtap") }
                onClicked: listItem.select()
            }

All worked fine with Qt 5.9.6 in Android 7.1. But with Qt 5.12.5 I cannot understand why most double taps are skipped. The message "doubtap" appears rarely. It is not predictable when the double tap will be ignored or accepted. This does not depend from tap speed, hold speed or else. Did anybody already investigate the reason? I am in low start position to write another one bug report...