It is not uncommon for light to shine under a door when it does not have a doorstep as seems to be the case here. Try exchanging it with an outer door and see if it shines under that.

It is not uncommon for light to shine under a door when it does not have a doorstep as seems to be the case here. Try exchanging it with an outer door and see if it shines under that.

Outer door you mean like a typical exterior wall door (for when a sim goes outside)? Tried a couple of different doors (one that is transparent and one that is a different door). 

Yes, that is what I meant. If you replace the double glass door (the light comes from there) with one that is solid the effect should go away. If not you can report that as a bug in the bug forum.

I did some testing on this, and the glitch does not occur unless the exposed room is an inner room, as in this build's configuration (it must be surrounded by a covered room (or rooms) on all 4 sides).  For instance, if you change the structure like this, light does not flow through the door:

If you add rooms to make it into an inner courtyard again, the light shines through:

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@BryonyRae wrote:

I did some testing on this, and the glitch does not occur unless the exposed room is an inner room, as in this build's configuration (it must be surrounded by a covered room (or rooms) on all 4 sides).  For instance, if you change the structure like this, light does not flow through the door:

If you add rooms to make it into an inner courtyard again, the light shines through:

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So in the default configuration, would this be considered a new glitch in the current patch? Prior to this patch I never experienced the lighting glitch (though I never noticed had it occurred in the past). 

It could well be, but it's hard to say for sure @cthoward491.  I never noticed it before, but I don't know when the last time I played with and/or built a structure with an inner courtyard was...  It's on the list now though, so I'm sure the devs will figure out how/when it cropped up.