Question / Help 'Ghost' image when switching scene

I'm trying to hunt down where I sometimes get a very brief weirdly colored 'ghost' image from an image source when switching from a scene containing the image source to a scene without said image source.
It never happens when I check the option to unload image if it isn't displayed (translated to English from a different client language version).

The 'ghost' image of the image source gets recorded too, so it isn't just a preview error.

What exactly does it mean when I check the option to unload the image/video/browser source?
What would be the advantage of checking it?
 
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