When you edit an ID column, it opens a form editor to edit the entire row at once.
The thinking was to make all columns editable _in some way_, but ID columns are autogenerated and thus not designed to be directly manipulated.
I thought: since the ID represents a unique entity, in this case document, then it made some sense to make editing that editing the whole row.
That said, this is a bug even with the explanation I just gave: editing on the ID column of Docs doesn't show all the row's data in the form. Will fix that shortly.