Hairstyle creates texture on two hats [ Edited ]

[xxBella20xx]

Product: The Sims 4
Platform: PC
Which language are you playing the game in? Deutsch
How often does the bug occur? Every time (100%)
What is your current game version number? 1.87.40.1030
What expansions, game packs, and stuff packs do you have installed? Get Together, City Living, Cats and Dogs, Seasons, Island Living, Discover University, Eco Lifestyle, Cottage Living, Spa Day, Parenthood, Dream Home Decorator, Luxury Party Stuff, Perfect Patio Stuff, Laundry Day Stuff, Tiny Living Stuff, Nifty Knitting Stuff, No Kits
Steps: How can we find the bug ourselves? The error occurs as soon as you select the mentioned pieces in CAS. (short curly hair, basegame + 2 hats, basegame)
What happens when the bug occurs? On the hats appears a longitudinal stripe in the color of hair
What do you expect to see? No stripe
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? No

Hello all
On 2 basegame hats (see pictures) a "hair color stripe" appears as soon as you wear the basegame hairstyle (short curls, see picture).

Edit By Crinrict: Adjusted title/adjusted font size for better readability