In ClauseBuddy, I noticed that if you insert a C9 clause which make use of
§this
removes the cross-reference in the Word document after inserting the clause. It results in nothing (empty). That said, the preview in ClauseBuddy does show the cross-reference correctly.
You’re right; it should actually show an error of some kind.
(Notice that, because the clause is inserted into the “dirty world” of MS Word, the automatic cross-referencing will not work. But it should at least give an error.)