I've been searching for any topics regarding this issue on the forums, but apparently no one has reported this yet, not that I know.
So here's the problem, when you use any FOV value that is significantly below 45 on your camera, you'll notice that the rendered range goes down and you end up with places on your animation that seem to be lacking shadows. The lower the value, the less shadows you'll see.
Normal:
With decreased FOV:
I'm not sure as to what is the cause of this but I'm sure that it can be a heck of a pain in the ass especially when you use a decreased FOV on a scene with a huge background where this glitch is most noticeable at. If you want to try this yourself, use a FOV value of 1 and you'll see that shadows completely disappear from the scene.
Is there any solution to this inside the program itself? :c