In the Navigator, clicking on Bookmarks shows both the bookmarks set as such by the user and the reference field codes (like _Ref392861719) set by Writer when the user inserts a cross-reference to something in the text. In earlier versions of LO, this did not happen.
Displaying these references is of no practical use, since unlike real bookmarks, they are not mnemonic. They can be clicked like a bookmark, but one cannot know where one will be taken by this. They can be deleted like a bookmark, but one does not know what one is deleting. They clutter up the list of the user's real bookmarks and therefore are a nuisance.
Steps to Reproduce:
1. Show Navigator (F5).
2. Click on Bookmarks.
Both real bookmarks and reference field codes are listed.
Only bookmarks set as such by the user should be listed.
User Profile Reset: No
OpenGL enabled: Yes
The settings menu (Options - LO Writer - View - Display) contains an item 'Field codes'. This is the place for the user to decide whether he wants to see the reference codes among his bookmarks. If it is unchecked, they should not be displayed.
Make sense. Moving to NEW
Inserted a cross-reference to a heading, a bookmark, and to a numbered paragraph, but nothing showed up in the Navigator under bookmarks. But inserted bookmarks appear under bookmarks in Navigator. Therefore:
Cannot reproduce with
Version: 18.104.22.168 (x64)
Version: 22.214.171.124.beta1 (x64)
Build ID: 4d7e5b0c40ed843384704eca3ce21981d4e98920
NB -- if you copy and paste text from webpages, this can introduce "mysterious" bookmarks into your navigator (under bookmarks). The given example _Ref392861719 does not look like the Field codes inserted with Libreoffice cross-reference.
In short, WFM
Commenting on Comment 2, NB:
I can now confirm that those useless bookmarks that show in the Navigator stem from the import of an MS Word file. However, this is nothing to calm down about. It is just another item of all that useless stuff that blows up the XML file of a Writer document; see Bug 136434.