Memory increase when resize QOpenGLWidget on 64bit Qt

I am experiencing a memory rise problem when using QOpenGLWidget, reproduce steps on my computer list as follow:
1. Use QOpenGLWidget;
2. Quickly resize the QOpenGLWidget.
The program memory comsuption will rise rapidly on resizing and have not fallen after I stop resizing.

Qt 64 bit on mac works fine.

Qt 32 bit on windows works fine.

And there is no problem with QOpenGLWindow.

My environment list as follow:

1. win10 (21H1, build 19043.1165)

2. Qt 5.15.2 msvc2019 64 bit

See attachment for test code and qtdiag results.