UPDATE (Septemper 10th, 2021): After quite some time, I figured that picking up a higher level of graphic details would make the textures to show up correctly. I don't understand why, but it worked.
There are certain objects in the game that appear as a black solid charcoal. I mean, they have the right shape, but they have no painted textures.
Some units are like that (I don't remember the name), some enemies also are like that (the toy cars from Gemini appear totally black to me). And sometimes even operators like Melita, Henrietta and others, they will show totally blackened out in the cut-in window that pops up during missions, usually in the Forest zone.
Please help me with this, it feels like something is missing. Thank you in advance!
Here are screenshots of many of these things:
Black silouhette of Brigitta (this one doesn't appear every time):
Black Melfonseana hat:
Black vines around Xion from the story:
Another black unit:
Black falspawn toy cars:
Totally black accessory without any texture: