2 shards, 2replica+arbiter each, connecting via mongos.

Hi there. I've dropped a collection, then continued to write data there(it was a lot of stale data, that I had to remove).
However, newly written data cannot be read from mongos, via mongod everything looks ok.

here some logs:

mongos>use vertis-creativework
mongos>db.pused.drop()

mongod logs:
Thu Jun 13 13:20:54 [conn1571507] command vertis-creativework.$cmd command: { drop: "pushed", $auth: { admin:

{ root: 2 }

} } ntoreturn:1 keyUpdates:0 locks(micros) w:12584 reslen:133 12ms
Thu Jun 13 13:20:54 [conn1408958] CoveredIndexMatcher::matches() {} 9:70c84318 0
Thu Jun 13 13:20:54 [conn1408966] CoveredIndexMatcher::matches() {} 9:70c84318 0
Thu Jun 13 13:20:54 [conn1408958] Matcher::matches() { ts: Timestamp 1371115254000|1, h: 630211948944288504, v: 2, op: "c", ns: "vertis-creativework.$cmd", o: { drop: "pushed", $auth: { admin:

{ root: 2 }

} } }
Thu Jun 13 13:20:54 [conn1408966] Matcher::matches() { ts: Timestamp 1371115254000|1, h: 630211948944288504, v: 2, op: "c", ns: "vertis-creativework.$cmd", o: { drop: "pushed", $auth: { admin:

{ root: 2 }

} } }
Thu Jun 13 13:20:54 [conn1408958] CoveredIndexMatcher _docMatcher->matches() returns 1
Thu Jun 13 13:20:54 [conn1408966] CoveredIndexMatcher _docMatcher->matches() returns 1

mongos>db.pushed.insert({_id:1})

mongod logs:

Thu Jun 13 13:23:08 [conn1571507] _reuse extent was:vertis-creativework.pushed now:vertis-creativework.pushed
Thu Jun 13 13:23:08 [conn1571507] allocExtent vertis-creativework.pushed size 1024 1
Thu Jun 13 13:23:08 [conn1571507] adding _id index for collection vertis-creativework.pushed
Thu Jun 13 13:23:08 [conn1571507] build index vertis-creativework.pushed

{ _id: 1 }

mem info: before index start vsize: 241624 resident: 6123 mapped: 119344
Thu Jun 13 13:23:08 [conn1571507] external sort root: /var/lib/mongodb/_tmp/esort.1371115388.220/
mem info: before final sort vsize: 241624 resident: 6123 mapped: 119344
mem info: after final sort vsize: 241624 resident: 6123 mapped: 119344
Thu Jun 13 13:23:08 [conn1571507] external sort used : 0 files in 0 secs
Thu Jun 13 13:23:08 [conn1571507] reuse extent was:vertis-creativework.pushed.$_id now:vertis-creativework.pushed.$id
Thu Jun 13 13:23:08 [conn1571507] allocExtent vertis-creativework.pushed.$id size 36864 1
Thu Jun 13 13:23:08 [conn1571507] New namespace: vertis-creativework.pushed.$id
Thu Jun 13 13:23:08 [conn1571507] done building bottom layer, going to commit
Thu Jun 13 13:23:08 [conn1571507] build index done. scanned 0 total records. 0.002 secs
Thu Jun 13 13:23:08 [conn1571507] New namespace: vertis-creativework.pushed
Thu Jun 13 13:23:08 [conn1571507] insert vertis-creativework.pushed keyUpdates:0 locks(micros) w:3851 3ms
Thu Jun 13 13:23:08 [conn1408958] CoveredIndexMatcher::matches() {} 9:70c85470 0
Thu Jun 13 13:23:08 [conn1571507] runQuery called vertis-creativework.$cmd { getlasterror: 1.0, w: 1.0, $auth: { admin:

{ root: 2 }

} }
Thu Jun 13 13:23:08 [conn1408958] Matcher::matches() { ts: Timestamp 1371115388000|1, h: -1867873785266695569, v: 2, op: "i", ns: "vertis-creativework.pushed", o:

{ _id: 1.0 }

}
Thu Jun 13 13:23:08 [conn1571507] run command vertis-creativework.$cmd { getlasterror: 1.0, w: 1.0, $auth: { admin:

{ root: 2 }

} }
Thu Jun 13 13:23:08 [conn1408958] CoveredIndexMatcher _docMatcher->matches() returns 1
Thu Jun 13 13:23:08 [conn1571507] Setting temporary authorization to: { admin:

{ root: 2 }

}
Thu Jun 13 13:23:08 [conn1571507] command vertis-creativework.$cmd command: { getlasterror: 1.0, w: 1.0, $auth: { admin:

{ root: 2 }

} } ntoreturn:1 keyUpdates:0 reslen:94 0ms
Thu Jun 13 13:23:08 [conn1408958] getmore local.oplog.rs query: { ts:

{ $gte: new Date(5880820189783654401) }

} cursorid:2864578847244946404 ntoreturn:0 keyUpdates:0 locks(micros) r:478 nreturned:1 reslen:121 169ms
Thu Jun 13 13:23:08 [conn1408966] CoveredIndexMatcher::matches() {} 9:70c85470 0
Thu Jun 13 13:23:08 [conn1408966] Matcher::matches() { ts: Timestamp 1371115388000|1, h: -1867873785266695569, v: 2, op: "i", ns: "vertis-creativework.pushed", o:

{ _id: 1.0 }

}
Thu Jun 13 13:23:08 [conn1408966] CoveredIndexMatcher _docMatcher->matches() returns 1

mongos>db.pushed.find()

mongod:
Thu Jun 13 13:24:35 [conn1571507] query vertis-creativework.pushed ntoreturn:0 keyUpdates:0 locks(micros) r:89 nreturned:0 reslen:20 0ms

mongos>db.pushed.stats()
{
"sharded" : false,
"primary" : "cs_mongodb-sh2-testing",
"ns" : "vertis-creativework.pushed",
"count" : 1,
"size" : 20,
"avgObjSize" : 20,
"storageSize" : 4096,
"numExtents" : 1,
"nindexes" : 1,
"lastExtentSize" : 4096,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 0,
"totalIndexSize" : 8176,
"indexSizes" :

{ "_id_" : 8176 }

,
"ok" : 1
}

mongos>db.pushed.find().explain()
{
"cursor" : "BasicCursor",
"isMultiKey" : false,
"n" : 0,
"nscannedObjects" : 1,
"nscanned" : 1,
"nscannedObjectsAllPlans" : 1,
"nscannedAllPlans" : 1,
"scanAndOrder" : false,
"indexOnly" : false,
"nYields" : 0,
"nChunkSkips" : 1,
"millis" : 0,
"indexBounds" : {

},
"server" : "cs-mongodb02gt.yandex.ru:27017",
"millis" : 0
}

in config.collections there is no document for mentioned collection.