Based on a staff member’s replay, selection surface object is deprecated:
It doesn’t say it is deprecated in documentation. The more important question is why it is used by studio itself when the object should not be used anymore if deprecated. The object is used when adding a decal and selecting a face of a part:
If it was up to me, I would keep these instances maintained as making a bunch of base parts with physics-based properties seems like a waste of memory to me. But if it’s deprecated, it should be marked as deprecated and not used by studio interface.
Expected behavior
Mark it as deprecated or maintain it. If deprecated, make the studio interface not use the object.
Page URL: https://create.roblox.com/docs/reference/engine/classes/SurfaceSelection