Snap To Grid doesn't function in the Static Mesh Editor's Perspective View when moving Sockets

When moving Sockets around in Orthographic View with Snap to Grid enabled, Sockets snap to the Position Grid Snap value when moved along the Grid. In Perspective View this is not the case and moving any Sockets acts as if Snap to Grid is disabled even if it is enabled.

This issue was found and tested in 4.18.3 (CL- 3832480). This bug can also be reproed in 4.19.2 (CL-4033788), 4.20 Preview 4 (CL-4154964), and Main 4.21 (CL-4169600)

1. Open the UE4 Editor
2. Open any Static Mesh
3. Create a Socket for the Static Mesh
4. Make sure Snap to Grid is enabled. If its not then enable it.
5. Drag the Socket around in Perspective View and any Orthographic View

Results: Sockets don't snap to the grid in Perspective View but they snap in Orthographic View.

Expected: Sockets snap to grid in Perspective View