What common mistake do developers make with Nested eager loading, why does the mistake cause problems, and what is the safer approach?

What common mistake do developers make with Nested eager loading, why does the mistake cause problems, and what is the safer approach? One recurring problem with nested eager loading is applying it without understanding the boundary it protects. Adding eager loading everywhere without considering payload size; loading ten large relationships can be as problematic as under-loading. In addition, Related relationships can be eager loaded through nested relationship paths. Safer engineering approach: keep the responsibility in the correct layer, use the framework's supported API, validate and authorize inputs, avoid hidden side effects, and verify the behavior with tests.