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I ran into this evergreen failure when submitting a patch build for the $in work in SERVER-49841.
There were a handful of failures in the burn_in_test jscore sharded/causally consistent sharded passthroughs.
https://spruce.mongodb.com/version/5f6a64f11e2d17450be051e6/tasks
I was able to produce a minimal reproduction locally (see the attached in_repro.js file) with the following command
buildscripts/resmoke.py run --suites=causally_consistent_jscore_passthrough_auth --storageEngine=wiredTiger --installDir=dist-test/bin --continueOnFailure --jobs=4 --repeatTestsMax=1000 --repeatTestsMin=2 --repeatTestsSecs=600.0 --shuffle --storageEngineCacheSizeGB=1 in_repro.js
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The minimal doc set is the following,
let docs = [ {x: BinData(1, "AAA=")}, {x: BinData(2, "AAA=")}, ];
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The $in query that failed contains a BinData item with the deprecated subtype 2,
coll.find({x: {$in: ["b", BinData(2, "AAA=")]}}
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It should be noted that this query doesn't fail with sbe off/on as the jsCore_slot_based_execution suite passes as well in this build as does jsCore.
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