Give a client connected with the options:

{
  connect: :sharded,
  read: {
    mode: :primary_preferred
  }
}

When sending commands like client.command(rolesInfo: 1), it also sends a $queryOptions option along which is not supported when issuing a command like that.

The following Mongo::Error::OperationFailure is sent back:

"$queryOptions" is not a valid argument to rolesInfo (2)

I'm not entirely sure this has anything to do with sharded setups actually. It might be more general than that.