About: http://webisa.webdatacommons.org/99999822

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I am not contesting whether the behavior you spotted is a bug, just suggesting a way you might be able to work around it.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com