At the moment, using the Auto Generated Image feature in your place configurations will cause humanoid names to be visible in the generated image. If your game relies on humanoid names a lot, it makes the thumbnail look very poor.
Humanoid names are clearly visible in the thumbnail
The bug happens 100% of the time. To recreate it, create a new place and save it with the camera facing a humanoid. Then go into Configure Place and select the Thumbnails tab or the Game Icon tab. Click the Auto generated Image (Free) option. Right click–>Open image in new tab on the generated image to preview it. The humanoid(s) should be visible.