invisible pictures

My pictures have become invisible. I can break the invisible frames, but when I go to put a picture on the wall it takes it's place but it's invisible. Like there is nothing there. I can break it, and even see pieces fly around as if I broke it, but they are invisible. Can you fix this issue? And the version I have is supposed to be 1.16.201 or something like that. It's minecraft education for Window's 10 PC.