Materials are broken (textures are unlinked)

Hello UE community, we’ve a project where we finished up creating our scene. After switching between 2 scenes - all the materials got broken. The redirectors were fixed before, the project was built and we didn’t change any folder locations for the project. Who has encountered this problem and how can we solve it?

After building and fixing redirectors we didn’t make any other changes

  1. We didn’t relocate any folders
  2. We didn’t change any names
  3. Just created a new scene and switched there and after it all the materials got broken.
  4. All the textures and materials still exist in the project, just they are unlinked from each other - so we have blank materials now.