[ARCHIVED] Issues with Skin Tone Genetics (Patch 1.69.59)

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Often (50% - 99%)
What is your current game version number? 18.5
What expansions, game packs, and stuff packs do you have installed? All expansions, all game packs except Journey to Batuu, and all stuff packs.
Steps: How can we find the bug ourselves? Go into create a sim, or look at auto-generated babies in manage households - other households.
What happens when the bug occurs? I have noticed that black sims (not tan, but very dark skin tones) are having babies with white skin, at the palest skin tone option.
What do you expect to see? Very pale toned babies and children when they should be dark skin tones.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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I have seen this problem in both households that I am playing, and in households I have never played. I have checked to make sure the parents are both dark skinned, and they are, so I can see no gameplay related reason for this to be happen. I can go into cas and change the babies skin tone to a darker one, but this is a little annoying to do for all of my families, especially with unplayed households having babies all the time.