Hi!
I had the same issue when rendering some megascans foliage with the MRQ in a scene. The solution for me was just reopening the project. I don’t know what causes the problem but i suspect is some sort of memory/texture related thing since every other texture worked fine. Btw i was running the scene on a 12GB 3080Ti, i9 10900K and 32GB of RAM. I have to say that the project was located in an internal HDD while Unreal is located into a much faster SSD.
Hope this helps to figure out a little bit more about the issue!