M2Doc technical error

… .to be more precise: a reference to e.g. a Figure (Word cross-refernce) works. Also, a m2doc field such as ‘Figure’.asBookmarkRef(’_Ref65060723’) to the same Figure caption works (the link is in the generated documetn and is navigable), but it also seems to generate an unpleasant error message in the target document “dangling reference for bookmark _Ref65060723”. Why is that?