How to reproduce:
1. Open the attached “IN-98275“ project
2. Open the “SampleScene“
3. In the Hierarchy window, select the “Circle“ GameObject
4. Make sure the GameObject has the “ShadowCaster 2D“ component in the Inspector window, where “Casting Source“ is set to “ShapeEditor“
5. Observe the results in the Console window

Expected result: There are no errors in the Console window
Actual result: {{NullReferenceException}} errors are displayed in the Console window

Reproducible with: 6000.0.39f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8
Not reproducible with: 2022.3.60f1, 6000.0.38f1
Couldn't test with: 2021.3.50f1 (there isn't a Casting Source on the Shadow Caster 2D component)

Reproducible on: MacOS 15.3 (M4), Windows 11 (by user)
Not reproducible on: No other environments tested

Note: The issue won’t reproduce if the “Casting Source“ is changed from “ShapeEditor“ to “Sprite Renderer“