Just noticed something else: it looks like having the Attach checkbox set to true does not save the documentation, see this repro capture :
To summarize :
With Attach set to false, adding documentation to pin marks the patch as changed (* near the document name) and pressing CTRL + S saves the documentation (which is the expected behavior)
With Attach set to true, it looks like the documentation is never written to the patch and pressing CTRL + S actually deletes it.
Any plan to have a look at this one? This makes it almost impossible to document libraries, since pin and node descriptions seem to randomly disappear when interacting with the documentation window.