How to fix a blinking window in Task Manager on Windows Server 2019?

Question

User interface

Hello everyone, I ask you to advise on the problem.
Hyper-V has Windows Server 2019 installed, and sometimes glitches start in the task manager.
User icons are displayed incorrectly - they disappear altogether, when you select the Send message menu - the window does not appear at all, but only the window frames blink and disappear.
The latest updates are installed, with hardware and OS - everything should be correct.
Where can I find the cause of the problem?