I'm missing collections when performing "show collections" on a mongos. My Setup is a sharded Cluster with 3 config serves and currently 7 shards.

I checked one collection more closely and can see this collection in sh.status(). I can also see the collection on all 3 config servers by doing db.collections.find(). Also a db.collection.find() on the mongos provides a correct answer.

Another effect is that chunk balancer is failing with