CharacterBody3D's real velocity is inaccurate when colliding

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Godot version

4.0

System information

windows 10

Issue description

The real velocity of a CharacterBody3D becomes inaccurate in cases where it is colliding against a surface, in this case a wall.

Steps to reproduce

Run the example project and push against the wall at an angle.

Minimal reproduction project

realVelocityBug.zip