Camera cuts track is over exposed (white thumbnail error)

I have added level sequence with camera properly. It works when it is a game project, but when I use Architectural projects (engine version 4.25.4) it gives white thumbnail, it can be over exposed thumbnails( for camera cuts track).
Please let me know, which setting I need to change, so I can see the scene sequence in the thumbnail properly.

I did link the camera with level sequence properly.
Please see the screen shots. I have added a bug report in the screen shot, not sure if it is related to this issue.
In the screen shot, in right hand side you can see the white thumbnail issue and in left side shows a previous error report.