Smalyshev added a comment.

RDF dumps confirm that data is coming fine through

This also happens for single-update items, which haven't been touched for a while, so it's not some kind of update race. Weird thing is it happens on multiple servers in the same way. E.g. check on Q3601865 reveals:

['wdq21', 'wdq22', 'wdq23', 'wdq24', 'wdq25', 'wdq26'] - are fine
['wdq6', 'wdq7', 'wdq8', 'wdq9', 'wdq10'] - are missing rank statements for Q36018657-1D11B168-9B90-44EF-88EE-4B8B09EE08A8 - all for the same statement ID!
['wdq5', 'wdq4', 'wdq3'] - are missing rank statements and P2860 statement for the same statement.

This does not look completely random data corruption - something is going on. I'll try to dump SPARQL we're sending next to see what's up there.


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