Using low field of views breaks SelectionBox

When I use lower field of views such as 5, SelectionBoxes become super thin when they are much thicker in studio. I have also noticed that materials become blurred and possibly that dynamic lighting doesn’t work (I may be wrong on this). But I don’t know if these are bugs or they are just meant to be the effects of using such a low field of view.

Here are two screenshots that show this:

In studio (field of view = 70):

In game (field of view = 5):

Also it seems that the closer the SelectionBox is to the camera, the more relative to its size it becomes.
With the FOV set as 5, the size of the SelectionBox set to 0.287 or lower will set the SelectionBox to a very thin size, and setting it to 0.288 or greater will allow to the SelectionBox to be relative to the actual size set. This is an issue because you can’t actually set the size of the SelectionBox to a specific size, and it is either very thin, or too thick and there is no way to have it sized in between these two sizes.

If I am missing something or maybe this is suppose to happen?
Let me know, thanks.