Plane constructors inconsistent

Release Type: Official Release

Version: All versions up to the latest (4.2.0.2381 as of this issue)

Platform(s): All (tested on Windows)

Describe the bug
From #2670, I believe according to the documentation:
The distance of the plane along its normal from the origin. means positive 'D' moves in the positive direction of its normal vector.`

This would imply Plane.D represents the plane equation in the form P.N = d instead of P.N + d = 0

This line of thinking is true for the following constructor:

var p = new Vector3(0, 1, 0);
var normal = new Vector3(0, 1, 0);
var plane = new Plane(p, normal);
System.Diagnostics.Debug.WriteLine($"Normal: {plane.Normal}, D: {plane.D}");

This returns

Normal: X:0 Y:1 Z:0, D: 1

However, the following constructor returns the wrong 'D' value (three points sitting on Y = 1, made in anticlockwise direction)

var p1 = new Vector3(-1, 1, -1);
var p2 = new Vector3(-1, 1, 1);
var p3 = new Vector3(1, 1, 1);
var plane = new Plane(p1, p2, p3);
System.Diagnostics.Debug.WriteLine($"Normal: {plane.Normal}, D: {plane.D}");

This returns

Normal: X:0 Y:1 Z:0, D: -1

I have changed the three points to clockwise (to double check anticlockwise is the correct way to get the plane pointing up):

var p1 = new Vector3(-1, 1, -1);
var p2 = new Vector3(-1, 1, 1);
var p3 = new Vector3(1, 1, 1);
var plane = new Plane(p1, p3, p2);
System.Diagnostics.Debug.WriteLine($"Normal: {plane.Normal}, D: {plane.D}");

This returns

Normal: X:0 Y:-1 Z:0, D: 1

This confirms the three points should be anticlockwise to make the normal point "outwards", but D is now flipped.

Expected behavior
In my opinion, my thinking is D: 1 is the correct value, but I am doubting myself now, so now need confirmation from others.

Additional context
Related to #2670

Unfortunately, System.Numerics also follows the same issue with the three points (assuming this is an issue)
https://github.com/dotnet/runtime/blob/1d1bf92fcf43aa6981804dc53c5174445069c9e4/src/libraries/System.Private.CoreLib/src/System/Numerics/Plane.cs#L62
Their documentation also states
D represents The distance of the plane along its normal from the origin.
so now I'm doubting which way the plane equation is supposed to be.

EDIT:
Some poor dev in the past also casting doubt:
https://github.com/stride3d/stride/blob/975c8a8ea55cf2ab20a64a32a261eb62d6922bce/sources/engine/Stride.Rendering/Rendering/SortModeDistance.cs#L42
https://github.com/stride3d/stride/blob/975c8a8ea55cf2ab20a64a32a261eb62d6922bce/sources/engine/Stride.Rendering/Rendering/VisibilityGroup.cs#L117

Start by comparing the Plane constructors and their documentation with the related discussion in #2670. Review sources/engine/Stride.Rendering/Rendering/SortModeDistance.cs and VisibilityGroup.cs, plus the linked System.Numerics implementation, to establish the intended plane equation and sign convention. Done means the convention is decided and the constructor, documentation, and affected usages agree.