What are Redirectors?
To facicilitate a smooth experience, when moving/renaming assets inside Unreal Engine a redirector is created to ensure no references are broken.
This leaves the developers responsible for “fixing” those redirectors by performing the full operation when it’s more convient.
Fixing redirectors
Project Wide
To quickly fix all directors in your project, navigate the Toolbar menu and start the Cleanup redirectors
operation.
Standard ways
Unreal provides multiple ways to fix redirectors explained here.