Textures suddenly become invisible or translucent

When I opened the project I’m working on, suddenly textures become invisible or translucent. The day before I added sprint and crouching animation to the main character, I saved and everything was fine. Updating the engine or installing a newer version has done nothing. This is the only project where this has happened so far. It can’t be cloned either. Below I attach screenshots as it looked before and after. Anybody have any idea how to fix it?