Aliens are unmasked in the library and world administration

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? 1.59.73.1020
What expansions, game packs, and stuff packs do you have installed? all of them
Steps: How can we find the bug ourselves? try to save an alien from Cas or take a look in the world administration for a household of an alien
What happens when the bug occurs? the aliens only appear on the thumbnails without their diguise
What do you expect to see? that aliens again appear on the thumbnails with their diguise.
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? Yes
Please describe the patch or change you made. I think it may have changed after the great patch in december 2018

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This problem appears to have existed since the last patch. Before that, the alien appeared in their disguise. Now they only appear in alien clothing.