Circe - Magnolia problem example

Endpoint.scala

import io.circe.magnolia.derivation.encoder.auto._
import org.http4s.rho._
import cats.implicits._
import cats.effect._
import com.us.repos._

class AppsEndpoint[F[+ _]: Effect](appsDao: AppsRepo[F], swaggerSyntax: SwaggerSyntax[F]) extends RhoRoutes[F] {
  import swaggerSyntax._
  
  // If appsDao.list is F[Seq[App]] then the jsonEncoder outputs '[...]'
  // If appsDao.list is F[List[App]] aka colon::colon then the jsonEncoder outputs '{"::": [...]}'
  "List apps" ** GET / "apps" |>> {
    appsDao.list.flatMap(x => Ok(x))
  }
}