When building queries for embedded documents, if one scope calls another that uses an order_by(), then the query acts as if the embedded document is not embedded and queries for the non-existant collection.

See attached example code. Log entries showing the incorrect queries against "insides" are also generated.

Including the order_by() in the parent scope works correctly.

Tested and confirmed as broken in 5.0.1, 5.0.0-stable, and master. Worked in Mongoid 4.