In the Smart Search, when user wants to search on the Path, he can select the folder from a tree instead of typing the whole path. But, if a folder in the path has been renamed at any moment, the path that is automatically put in the query field is not correct because it takes the new folder name.
For instance, I have a folder that was called "my folder" and that I renamed into "Pouet". When I select the folder in the Path tree, I get this query: "ecm:path STARTSWITH '/default-domain/workspaces/Pouet'", which doesn't return any result. The query that works is "ecm:path STARTSWITH '/default-domain/workspaces/my folder'".