In text of Dictionaries, 9.3.5.1 Examples
http://www.tei-c.org/release/doc/tei-p5-doc/en/html/DI.html#DITPEG
it says "When a source is indicated, the example should be marked with a cit element:"
it should be "with a bibl element", as all examples are marked with cit, regardless of whether they have a source.
Agree. We could then extend to "a bibliographic reference" (could be bibl or biblStruct, or ref, if the core sources are described in the header.
Fixed in rev 13269. Thanks for the report!