Zoom 6.2.2 display is keeping automatically changes, even display is set as "MANUAL".

During Zoom meeting, When I'm  far away from the camera, the light becomes darker, and when I'm  closer, the light becomes brighter, but the automatic dimming is disabled.  Don't know what's going on ?

The issue is:
It only happens when updated to Zoom 6.2.2 suddenly,    the lighting is not keeping  changing in previous version 6.1.11  . There are no any setting changes during the updates. 

ok