Raycast2D not casting to the right position when casting the ray in code

[mkhoi07]

Godot version:

3.2.3

OS/device including version:

Windows 10

Issue description:

Casting a raycast2D to a position using code doesn't cast the ray to the right position.

Like this example where i cast the ray onto the mouse's global position but the ray doesn't cast to the correct position:

Steps to reproduce:
In code, just cast a ray into the position of any object and the ray won't cast to the exact location of the object.

Minimal reproduction project:

RaycastIssue.zip

[Calinou]

Duplicate of #34805 and possibly others.

This is due to mouse coordinates being reported incorrectly by Godot, rather than the raycast preview.