QuickWidget causes a slow increase in memory

Run the demo. Click show. Check the memory usage of the program. close the window. Click show again. Check the memory usage. When using QQuickWidget, the memory will slowly increase to a fixed value.

When using QQuickVIew, the memory is almost stable.

When using software rendering, whether it is QQuickWidget, QQuickVIew memory is almost stable.

It can only be reproduced on devices without a discrete graphics card, such as RK3399.