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WDQS sync (?) issue for certain recently created items
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I have found the query service to be consistently (*almost* always, over the past several weeks at least) missing some items - an example is Q30252826:

SELECT ?item  WHERE { ?item rdfs:label "Technology Centre"@en . }
SELECT ?item  WHERE { ?item wdt:P856 <> . }
SELECT ?item WHERE { ?item wdt:P2427 'grid.17033.36' .}

these occasionally return a correct response with this one item, but usually return nothing - either in the WDQS GUI or via JSON download. There seem to be a handful of missing items - Q30252828 is another. However, Q30252827 is fine:

SELECT ?item  WHERE { ?item rdfs:label "Mediterranean Center for Environmental Studies"@en . }

returns Q30252827 consistently.

It's a little disturbing to have the query service completely missing some of what's in wikidata.

Event Timeline

Of course, now these examples I gave are working - probably because I updated them recently. However, I found more that are not now, or only partially - for example Q2256713:

SELECT ?item WHERE { ?item wdt:P856 .}
SELECT ?item WHERE { ?item wdt:P2427 'grid.483048.3' .}

return nothing, but

SELECT ?item WHERE { ?item rdfs:label "Schweizerisches Institut für Kinder- und Jugendmedien"@en .}

returns Q2256713.

SELECT ?item WHERE { ?item wdt:P856 .}

is not a valid query. But this is:

SELECT ?item WHERE { ?item wdt:P856 <> .}

And seems to be consistent on all servers. Same with other query. So maybe it's caused just by delays in updating?

Assuming it has been resolved, please reopen if I'm wrong.