FixMyMesh
Why Unreal recomputes your Blender normals, and how to prove it
One import setting decides whether your sharp edges survive the trip from Blender to Unreal Engine. Here is the measurement, with the numbers.
Blog
What actually happens to your asset.
Short technical notes, each built on a measurement we can reproduce: the engine version, the setting, and the number it produced.
Blender to Unreal scale: 2 metres becomes 200, and that is correct
Unit conversion between Blender and Unreal is a frequent source of false alarms. What a correct conversion looks like, measured, and what a real scale bug looks like.
Godot does not store your normals exactly, and your tests should know it
Godot compresses vertex normals on import. The deviation is tiny, measured, and it breaks any comparison written with an exact equality.
Importing an FBX into Unreal from the command line, and reading what came out
The exact command line, the plugins you need, and the one Python call that gives you the render vertices. Measured on Unreal Engine 5.8.