The problem arrises when doing a find on a collection with collation, and then chaining a count_documents on the end. For example:

db[:band].insert_many([{ name: "Depeche Mode" }, { name: "New Order" }])
db[:bands].find({ name: 'DEPECHE MODE' }, { collation: { locale: 'en_US', strength: 2 }}).count_documents

This would return 0, because the count_documents function doesn't get the collation option from the View generated by find.