this report has been filed here:

https://bugs.edge.launchpad.net/ubuntu/+source/nautilus/+bug/585750

"it is reproducible, follow the steps:
1. Open a folder with subfolders in it
2. Set the view type to List
3. Click on the + sign before any of the subfolders to expand the folder, to see its contents
4. Click the Refresh button or press F5 to refresh the folder contents

Expected result: The folder contents are refreshed, the expanded folders remain expanded, the collapsed ones remain collapsed

Result: The folder contents get refreshed, but all subfolders which were previously expanded, are collapsed, so the view is set to its initial state, like it was when you have opened the folder."