After zooming in and out multiple times through the touch screen, the page in webengineview will not be able to zoom in and out and scroll

I am using the simplebrowser in the example. Runs on win10 and has a touch screen. Open the website www.csdn.net, and then repeat zooming in and out with your fingers. After a few times, you will find that you cannot zoom in and out of the page, and you cannot scroll either. But the links on the page can be clicked.
Add event listener through JavaScript code(as below). When the finger slides on the screen, under normal circumstances, the touchmove event can be received, and there is also a scroll event after the touchmove event. But when the exception occurs, touchmove can be received, but there is no scroll event.

document.addEventListener('touchstart',function (event) {
console.log('touchstart') })
document.addEventListener('touchmove',function (event) {
console.log('touchmove')})
document.addEventListener('scroll',function (event) {
console.log('scroll')})

the same thing I did on chrome with same core version, but it works fine. 
A strange issue.