Attached is a simple Writer document meant to be used with Mail Merge.
It references Bibiliography.biblio.

Instructions for reproducing the bug.
1. Open the document.
2. Open the Data Sources.  Make sure that the standard Bibliography.biblio is
there. Open Bibliography.Tables.biblio.
3. Select the first row, the one with identifier BOR02a.
4. Click on Data to Fields.  The fields in the document should be filled out.

When I do this, it says:
This is a Big book (more than 500 pages!), published less than a year ago.

5. Put your cursor in front of "This is a Big book".  Hit the Delete key once.
The first phrase "This is a Big book (more than 500 pages!)," should be deleted.

The problem:
the second phrase changes to "published more than a year ago." (Which is what it
SHOULD be!)
The same thing happens if you do Mail Merge, then Output to a File.