Just doing some research and it appears that this starts with 3.4 and has something to do with a viewer node in the geometry nodes editor. Apparently it can now be used or is shown in the 3D Viewport. Sorry, I haven’t done much with geometry nodes and I’m not familiar with this viewer node, but the information that isn’t displaying in the spreadsheet is linked to the development of this node and linking it to the 3D Viewport. Now I’m off to read the blender manual about this node.