Steps to reproduce:

1. Add widget "Problems by severity" on the dashboard
2. Hover over any value for a pop-up window to appear and hold for about 10-15 seconds
3. Move the cursor to another location

Result:
The pop-up window does not disappear. And there is no cross on it to close, as when you click on an element. It does not disappear under any circumstances, except for updating the page. This happens when you hover over any of the widget elements.
There is nothing in the nginx and php logs. Nothing appears in the browser debug console at this time either. The nginx config is used as standard from zabbix 5.4.2. The problem was first detected on 5.4.2, then I updated to 5.4.3 and the problem persisted. This is a clean setup.
Expected:
The pop-up window disappears when you move the cursor.