ComboBox highlight jumps around when using arrow key navigation

Current behavior

When using the arrow keys to select an element in a ComboBox popup, the highlight often jumps back to the mouse position when the arrow key is released.

import QtQuick
import QtQuick.Controls.Basic

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("ComboBox arrow keys bug")

    ComboBox {
        anchors.centerIn: parent
        model: Array.from(Array(100).keys())
    }
}

Screen recording attached.

Expected behavior

The highlight should be determined solely by the arrow keys (until the user moves the mouse, of course).

Reproduction

Example code attached. I tested this on Windows + Mac and was able to reproduce it on both platforms.