I could not see any errors related to the specific recovered nodes in the browser console (I have some errors related to another node configuration but I don't think it is related, they are all related to a nexmobasic api key)
In the first view you can see parts of recovered nodes in the upper left corner. Zooming in or out does not make them more visible. Selecting all (Command A in mac) and then drag them into the workspace makes them visible but they are still piled on top of each other. Moving them apart one-by-one makes them visible. In my case 3 in total of type node-red-contrib-string
Only place I use this node, also 3 in total, is in a disabled flow tab
My errors in the console