dcausse added a comment.

  The is "somehow" affecting commons as well eventhough the RDF on commons 
remains "parseable".
  
  Here is a extract of 
https://commons.wikimedia.org/wiki/Special:EntityData/M211196.ttl?flavor=dump 
to illustrate the issue:
  
    @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
    @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
    @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
    @prefix owl: <http://www.w3.org/2002/07/owl#> .
    @prefix wikibase: <http://wikiba.se/ontology#> .
    @prefix skos: <http://www.w3.org/2004/02/skos/core#> .
    @prefix schema: <http://schema.org/> .
    @prefix cc: <http://creativecommons.org/ns#> .
    @prefix geo: <http://www.opengis.net/ont/geosparql#> .
    @prefix prov: <http://www.w3.org/ns/prov#> .
    @prefix wd: <http://www.wikidata.org/entity/> .
    @prefix data: <https://www.wikidata.org/wiki/Special:EntityData/> .
    @prefix s: <http://www.wikidata.org/entity/statement/> .
    @prefix ref: <http://www.wikidata.org/reference/> .
    @prefix v: <http://www.wikidata.org/value/> .
    @prefix wdt: <http://www.wikidata.org/prop/direct/> .
    @prefix wdtn: <http://www.wikidata.org/prop/direct-normalized/> .
    @prefix p: <http://www.wikidata.org/prop/> .
    @prefix ps: <http://www.wikidata.org/prop/statement/> .
    @prefix psv: <http://www.wikidata.org/prop/statement/value/> .
    @prefix psn: <http://www.wikidata.org/prop/statement/value-normalized/> .
    @prefix pq: <http://www.wikidata.org/prop/qualifier/> .
    @prefix pqv: <http://www.wikidata.org/prop/qualifier/value/> .
    @prefix pqn: <http://www.wikidata.org/prop/qualifier/value-normalized/> .
    @prefix pr: <http://www.wikidata.org/prop/reference/> .
    @prefix prv: <http://www.wikidata.org/prop/reference/value/> .
    @prefix prn: <http://www.wikidata.org/prop/reference/value-normalized/> .
    @prefix wdno: <http://www.wikidata.org/prop/novalue/> .
    @prefix sdc: <https://commons.wikimedia.org/wiki/Special:EntityData/> .
    @prefix sdcdata: <https://commons.wikimedia.org/wiki/Special:EntityData/> .
    @prefix sdcs: 
<https://commons.wikimedia.org/wiki/Special:EntityData/statement/> .
    @prefix sdcref: 
<https://commons.wikimedia.org/wiki/Special:EntityData/reference/> .
    @prefix sdcv: 
<https://commons.wikimedia.org/wiki/Special:EntityData/value/> .
    @prefix sdct: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/direct/> .
    @prefix sdctn: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/direct-normalized/> 
.
    @prefix sdcp: <https://commons.wikimedia.org/wiki/Special:EntityData/prop/> 
.
    @prefix sdcps: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/statement/> .
    @prefix sdcpsv: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/statement/value/> .
    @prefix sdcpsn: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/statement/value-normalized/>
 .
    @prefix sdcpq: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/qualifier/> .
    @prefix sdcpqv: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/qualifier/value/> .
    @prefix sdcpqn: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/qualifier/value-normalized/>
 .
    @prefix sdcpr: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/reference/> .
    @prefix sdcprv: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/reference/value/> .
    @prefix sdcprn: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/reference/value-normalized/>
 .
    @prefix sdcno: 
<https://commons.wikimedia.org/wiki/Special:EntityData/prop/novalue/> .
    
    sdcdata:M211196 a schema:Dataset ;
        schema:about sdc:M211196 ;
        cc:license <http://creativecommons.org/publicdomain/zero/1.0/> ;
        schema:softwareVersion "1.0.0" ;
        schema:version "427450652"^^xsd:integer ;
        schema:dateModified "2020-06-19T04:58:57Z"^^xsd:dateTime .
    
    sdc:M211196 a wikibase:Mediainfo,
                schema:MediaObject,
                schema:ImageObject ;
        schema:encodingFormat "image/jpeg" ;
        schema:contentUrl 
<https://upload.wikimedia.org/wikipedia/commons/e/e4/Pillnitz_5.jpg> ;
        schema:contentSize "1330817"^^xsd:integer ;
        schema:height "2048"^^xsd:integer ;
        schema:width "1536"^^xsd:integer ;
        wdt:P571 "2004-07-25T00:00:00Z"^^xsd:dateTime ;
        wdt:P7482 wd:Q66458942 ;
        wdt:P6216 wd:Q50423863 ;
        wdt:P275 wd:Q50829104,
                wd:Q14946043 ;
        p:P571 sdcs:M211196-CB805361-B325-42C5-94D4-113F42BFFA2D .
    
    sdcs:M211196-CB805361-B325-42C5-94D4-113F42BFFA2D a wikibase:Statement,
                wikibase:BestRank ;
        wikibase:rank wikibase:NormalRank ;
        ps:P571 "2004-07-25T00:00:00Z"^^xsd:dateTime ;
        psv:P571 v:0070284a6ac7b1211aa18c76e9073347 .
    
    sdcv:0070284a6ac7b1211aa18c76e9073347 a wikibase:TimeValue ;
        wikibase:timeValue "2004-07-25T00:00:00Z"^^xsd:dateTime ;
        wikibase:timePrecision "11"^^xsd:integer ;
        wikibase:timeTimezone "0"^^xsd:integer ;
        wikibase:timeCalendarModel <http://www.wikidata.org/entity/Q1985727> .
  
  The problematic triple is
  
    sdcs:M211196-CB805361-B325-42C5-94D4-113F42BFFA2D psv:P571 
v:0070284a6ac7b1211aa18c76e9073347
  
  it improperly links to a `value` owned wikidata (`v: 
<http://www.wikidata.org/value/>`) while it should be from commons. The proper 
prefix is used when declaring the value itself 
`sdcv:0070284a6ac7b1211aa18c76e9073347`.
  
  The RDF remains valid but the link between the statement and its value is 
broken and will be unusable in the query service.
  
  side note: the sdc prefixes pasted here are affected by T258474 
<https://phabricator.wikimedia.org/T258474>

TASK DETAIL
  https://phabricator.wikimedia.org/T258507

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Silvan_WMDE, dcausse
Cc: dcausse, Addshore, Samantha_Alipio_WMDE, Aklapper, Silvan_WMDE, CBogen, 
Akuckartz, darthmon_wmde, Nandana, Namenlos314, lucamauri, Lahi, Gq86, 
Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, 
LawExplorer, _jensen, rosalieper, Scott_WUaS, Jonas, Xmlizer, jkroll, 
Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Lydia_Pintscher, Mbch331
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