The sub-items of the menu are not displayed properly when they are opened for the first time

In the case of using multiple languages, the sub-items of the menu are not displayed properly when they are opened for the first time.

As follows:

After opening it again, it is normal.

When I tested on the Qt 5.15.2 version, I didn't find this problem, everything was normal.

My computer has two displays, as shown in the image below, represented by screen A and screen B. The screen resolution and display percentage are drawn on the graph. This problem appears on screen B. This problem does not exist if only screen B or A is connected.

Although the Qt5 version does not display the problem on screen B, there is a problem with the display on screen A.