wdtn: values expand external-ids to full URLs (documented at https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Normalized_External_ID, and many issues here discuss this feature).
Eg for https://www.wikidata.org/entity/Q7095072.ttl:
@PREFIX wdtn: <http://www.wikidata.org/prop/direct-normalized/>. wd:Q7095072 wdt:P6366 "46831270" ; wdtn:P6366 <http://ma-graph.org/entity/46831270> ; wdt:P646 "/m/026gcj6" ; wdtn:P646 <http://g.co/kg/m/026gcj6> ; wdt:P4264 "ontotext-ad" ; wdt:P2671 "/g/1ts_52mq" ; wdtn:P2671 <http://g.co/kg/g/1ts_52mq> ;
P4264 has a valid formatterUrl, so why is this missing?
wdtn:P4264 <https://www.linkedin.com/company/ontotext-ad/>