| daniel added a comment. |
One source of confusion is the fact that the CachingPropertyInfoLookup used by client code and repo code are hitting the same cache entry. That cache entry ends up containing both prefixed (wikidata:P1) and unprefixed (just P1) property IDs, side by side. This in turn causes API modules, which use the repo service instances, to also accept unprefixed property IDs, which causes data corruption: MediaInfo entities can have some Statements that use prefixed property IDs, and some that use unprefixed property IDs, and these are treated as different and incompatible (correctly - according to the configuration, they come from different repos). Repo side code (in "split brain" operation) should not accept unprefixed property IDs or unprefixed item IDs, since there are no properties or items on the local repo.
Cc: WMDE-leszek, Cparle, Jdforrester-WMF, Abit, EBjune, Ramsey-WMF, Aklapper, daniel, Nandana, JKSTNK, Lahi, PDrouin-WMF, Gq86, E1presidente, Anooprao, SandraF_WMF, GoranSMilovanovic, QZanden, Tramullas, Acer, LawExplorer, Silverfish, Poyekhali, _jensen, D3r1ck01, Susannaanas, Wong128hk, Jane023, Wikidata-bugs, Base, matthiasmullie, aude, El_Grafo, Dinoguy1000, Ricordisamoa, Wesalius, Lydia_Pintscher, Fabrice_Florin, Raymond, Steinsplitter, Mbch331
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