NavigationRegion2D Not Rendering Cutout Consistently

[LeifintheWind]

Godot version

v4.1.2.stable.official [399c9dc]

System information

Windows 10

Issue description

When adding another outline with add_outline() to the NavigationRegion2D to create a hole via make_polygons_from_outlines(), sometimes the renderer does not create a hole and instead layers another polygon on top. This issue is somehow location-dependent, and is shown in the minimal reproduction project when the CollisionPolygon2D is placed at (-256,120) vs (360,-100) for example.

Unsure if this is necessary, but expanding the Polygon via offset_polygon() is used to create the outline in the project. I was unable to reproduce this bug without it. But I do not know if it's necessary.

Based on how the NavigationRegion2D is rendered with and without the hole, I believe this is not just a rendering issue but the hole is not actually created. As when the hole renders correctly it also is triangulated correctly, and when it doesn't the original NavigationRegion2D remains a single polygon.

Steps to reproduce

1. Create a NavigationRegion2D with a NavigationPolygon large enough to encompass another shape inside of it.
2. Create another Polygon inside of the NavigationRegion2D
3. Expand the Polygon via offset_polygon()
4. Add the Polygon vertices as an outline to the NavigationPolygon and then make_polygons_from_outlines()
5. Move the Polygon around until it does not render a hole correctly. This part is a bit of a mystery to me, but the minimal production project starts the Polygon in a position (-256,120) where it doesn't render correctly. Moving the Polygon to (360,-100) will cause the NavigationPolygon2D to render the hole correctly.

Minimal reproduction project

navigation_polygon_rendering.zip

[AThousandShips]

Can you please try this with a supported version, like 4.1.3 (only the latest patch version is supported, and it might already be fixed)

[smix8]

Same as #70823

The make_polygons_from_outlines() function has a lot of known problems that break the navigation mesh creation easily, hence why that function is deprecated in Godot 4.2 that adds 2D navigation mesh baking.

[LeifintheWind]

Looks like this issue is irrelevant! Thanks