With the NextGen update (version 1.10.980), Bethesda introduced a bug which caused textures to disappear from objects following a material swap. This was supposedly fixed with the subsequent update (version 1.10.984), but alas, the best laid plans of mice ...
The bug persists. Here is a sample of what is occurring: https://www.dropbox.com/scl/fi/tid04r1m2bf3rw00hz6ms/Fallout4-2024-05-24-20-54-46.mp4?rlkey=nupqtf5d40fgsraumkcpqqrkg&dl=0. I made this video on the evening of 24 Mar, 2024.
I have submitted this video and a description of the error to Bethesda, and now you know too.