Reproduction steps:
1. Open the attached “IN-101157_thief-on-a-train“ project
2. Open the “Assets/Scenes/SampleScene.unity“ Scene
3. Select the “lockpick group > tangibles > blocker“ GameObject in the Hierarchy
4. Set the “Shadow Caster 2D” Component’s “Casting Source” to “None“
5. Revert the “Casting Source“ field back to “Polygon Collider 2D“
4. Observe the GameObject’s Polygon Collider and the shadow under it inside the Game View

Expected result: The shadow is cast according to the Polygon Collider’s shape
Actual result: There’s no shadow underneath the GameObject

Reproducible with: 6000.0.48f1, 6000.1.2f1, 6000.2.0a10
Couldn’t test with: 2022.3.62f1 (couldn’t downgrade user’s project)

Reproducible on: M1 Max MacOS 15.1.1
Not reproducible on: No other environment tested