Window not showing transparent on diagonal wall [ Edited ]

[Megz77]

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.100.147.1030
What expansions, game packs, and stuff packs do you have installed? All of the available content
Steps: How can we find the bug ourselves? Build Mode - Growing Together. A Left-Side of Modern Art Window - Medium.
What happens when the bug occurs? When placing the window on a diagonal wall, the external side of the window loses its transparency. The internal side of the window displays as expected.
What do you expect to see? Ability to see through the window.
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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Window bug on diagonal walls. Build Mode - Growing Together. A Left-Side of Modern Art Window - Medium. When placing the window on a diagonal wall, the external side of the window loses its transparency. The internal side of the window displays as expected. It has been tested in multiple walls and lots and the bug appears to be consistent. It is only the medium size of the window that is affected and only the exterior side.

Edit By Crinrict: Adjusted Title to better reflect the issue

[CGrant56]

@Megz77 

I tested this and you are correct.  One side goes opaque when placed in a diagonal wall.  It is fine in regular walls.  Also, the Right-Side version of the window does not have the problem.

Hope this helps.