FWIW, while fixing Bug #1179200 "Bookmark folder tree collapsed on bookmarks update" I observed the same behaviour.
To solve the issue I implemented an "update-item" signal in the KatzeArray object.
The fix proposal for Bug #894143 "Unable to select multiple bookmarks for moving/deleting" contains the same addition expanded to multiple selection.
FWIW, while fixing Bug #1179200 "Bookmark folder tree collapsed on bookmarks update" I observed the same behaviour.
To solve the issue I implemented an "update-item" signal in the KatzeArray object.
The fix proposal for Bug #894143 "Unable to select multiple bookmarks for moving/deleting" contains the same addition expanded to multiple selection.