IndexOutOfRangeException Errors are thrown when editing 2D Freeform light and shape's edges overlap

Steps to reproduce:

1. Open the attached project
2. Open the SampleScene
3. Select the Freeform Light 2D object in the Hierarchy
4. In the Inspector window, click the Edit Shape button
5. In the Scene view, Edit the shape in a way, that edges overlap each other (Reference video attached)

Actual results: Multiple IndexOutOfRangeException errors are thrown while editing the Shape

Expected results: No errors or warning are thrown whe editing the Shape

Reproducible with versions: 6000.4.0b3, 6000.6.2f1, 6000.7.0b2, 7000.0.0a1

Not reproducible with versions: 6000.0.84f1, 6000.3.24f1, 6000.4.0b2

Tested on (OS): macOS 26.6.2

Notes:

• Reproduced with Freeform light object
• Issue did not reproduce when editing ShadowCaster 2D component's bounds in the same manner