Cross reference marker text shows in PDF bookmarks

System:     FM 2015 on Windows 10

User:          Very experienced FrameMaker and Acrobat user. Never experienced this issue before (in almost 20 years of use of FrameMaker).
                    No change in methods or techniques used that would explain the issue.

                   Contacted Adobe Acrobat, and was told Acrobat Pro DC does not support FrameMaker 2015, and was directed to contact Adobe FrameMaker.  

Use case:  Using unstructured FrameMaker to develop content.

                   Using standard FrameMaker cross reference functionality (inserting cross references) to create links to other sections within same document.

                   Cross references are 'Paragraph' type, not Cross Reference Marker type.

                    Generating PDFs from FrameMaker using Save as PDF functionality. (Using Adobe PDF printer, and Acrobat Pro DC is our PDF tool.)

Issue:         If a chapter title paragraph tag is the target of a cross reference (almost always the case), the bookmark in the generated PDF has a
                   repeated chapter number.
                   Examples:

• Bookmark with issue    "Chapter 1 Chapter 1 Overview"
• Desired rendering         "Chapter 1 Overview"

                 Note:  The repeated Chapter 1 in the bookmark is the auto-number components of the of the Chapter title tag
                              (the auto-number format for this tag = "Chapter"  plus the autonumber building blocks).

                  If I delete the cross reference marker from the chapter title tag, the bookmark render correctly (the chapter number is not repeated in the bookmark). 

                  This is not a viable work-around, because we cross reference chapter titles throughout our guides to direct users to other sections of the book.