Steps to reproduce:
1) Open the attached project.
2) Build for iOS using Metal as Graphics API.
3) Run the build on a device via Xcode.
4) When the app loads, press the 'SCREEN' button.
- Observe the captured area on a texture that appears.
5) Repeat 2-4 with OpenGLES 2/3 as the Graphics API.

When using Metal as the Graphics API, the area which is captured by Texture2D.ReadPixels is different from OpenGLES and the Editor.
This issue doesn't occur if the project is built as OSX standalone using Metal.

Reproduced on:
5.5.0b1, 5.4.0p3, 5.3.6p3