I wanted to update this thread as in further testing, I've noticed that the odd shadows are not relegated only to corners. I created a video to demonstrate how objects positioned in close proximity to a wall also have shadows behaving strangely.
I took a look at one of my older builds while testing another issue and noticed the strangeness, especially with the Boom Cube object that I used in it:
This effect of an almost transparent edging or shadow on the object definitely didn't exist when I originally created and published the build.
I have been able to rid these unwanted lines by going into the games graphic card settings (Lighting) and setting the ssao to "false" for each category i.e. low, medium, high, very high. Although you only really need to set the false value for the graphics setting you use in the game. It really is a simple fix
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