I restarted my computer many times today to do experiments. I found that “snipaste” software is not the reason, it may call some functions of windows.
In some cases, windows will enter a special “state”, this “state” needs to restart the computer to refresh. Clicking “Start”, “Search”, “Volume”, and “Time” in this “status” or opening taskmgr will cause the krita canvas shortcut to become invalid.
As for how to enter this state, I only found it appeared when I used Tencent QQ, the chat software in our area. When I manually enter the password, it will be abnormal, but remember the password will not.
I don’t know what QQ did. People in other countries will also have this problem without QQ, there must be something in common