I’ve been experiencing a lighting issue when crafting armor for characters. The simplest way I reproduced it was to spawn an animation editor dummy and a basic part and put them together.
The sections of the part on the light side of the character seem to have shadows cast towards the light from the character, and whenever the camera is moved the shadows/light flicker.
When the part is parented to the character it no longer experiences the issue, but if a part inside a model is inside the character, it will still experience the issue.