CharacterBody2D and body_test_motion do not detect corner collisions on CollisionPolygon2Ds with build_mode = BUILD_SEGMENTS

[Pizzaandy]

Tested versions

Reproducible in:
v4.3.dev3.mono.official [36e943b]

System information

Godot v4.2.1.stable.mono - Windows 10.0.19045 - GLES3 (Compatibility) - NVIDIA GeForce RTX 3070 (NVIDIA; 31.0.15.4665) - AMD Ryzen 7 3700X 8-Core Processor (16 Threads)

Issue description

CharacterBody2D and body_test_motion do not detect corners on CollisionPolygon2Ds built with segments. This can be seen by the CharacterBody2D launching off the corner of the polygon labeled "Segments."

BodyTestMotion_Against_Segments.mp4

The circle is a CharacterBody2D with the "Basic Movement" template script. Its snap length is set to 100px.

The box that follows the mouse is a static body that runs body_test_motion from the mouse downwards. It turns red when the test does not collide with anything.
Note that body_test_motion becomes less accurate as motion length increases, so its distance has been limited to 200 for this demo.

Steps to reproduce

1. Enable Debug -> Visible Collision Shapes
2. Run the MRP and use the arrow keys to move the CharacterBody2D
3. Observe that the character launches off the polygon labeled "Segments" and not the one labeled "Solids"
4. Hover the mouse above each polygon
5. Observe that body_test_motion does not detect a collision at the top of the polygon labeled "Segments."
6. Modify each collision shape to test as needed.

Minimal reproduction project (MRP)

MRP_CharacterBody2D_Segments_Bug.zip