[2d] [Sprite Shape] Error occurs when unselecting Cache Geometry for Sprite Shape prefab

Steps to Repro:
1. create sprite shape shape that uses Cache Geometry
2. make the sprite shape into a prefab
3. select sprite shape prefab and Edit Spline in Inspector
4. uncheck Cache Geometry

The following error appears:

Destroying assets is not permitted to avoid data loss.
If you really want to remove an asset use DestroyImmediate (theObject, true);
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

Note: The error does not occur when editing prefab in the Prefab Editor