Derived schema name for `List[T]` is `scala.collection.immutable.:: [BUG]

Tapir version: 1.7.3

Scala version: 2.12.15

When deriving a List[T] where T is defined inside of a companion object, the generated schema for List[T] is scala.collection.immutable.:: { head, tl }

How to reproduce?

import sttp.tapir.Schema
import sttp.tapir.generic.auto._

object TestSchema extends App {

  case class Container(values: List[Container.Value])

  object Container {
    case class Value(key: String, value: String)
  }

  case class Root(containers: List[Container])
  val s = implicitly[Schema[Root]]

  println(s.show)
}

This prints:

schema is SProduct(List(SProductField(FieldName(containers,containers),Schema(SArray(Schema(SProduct(List(SProductField(FieldName(values,values),Schema(SCoproduct(List(Schema(SProduct(List(SProductField(FieldName(head,head),Schema(SProduct(List(SProductField(FieldName(key,key),Schema(SString(),None,false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))), SProductField(FieldName(value,value),Schema(SString(),None,false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))))),Some(SName(whoco.sourcing.services.chat.TestSchema.Container.Value,List())),false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))), SProductField(FieldName(tl,tl),Schema(SRef(SName(scala.collection.immutable.List,List(Value))),None,false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))))),Some(SName(scala.collection.immutable.::,List(Value))),false,None,None,None,None,false,false,All(List()),AttributeMap(Map())), Schema(SProduct(List()),Some(SName(scala.collection.immutable.Nil,List())),false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))),None),Some(SName(scala.collection.immutable.List,List(Value))),false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))))),Some(SName(whoco.sourcing.services.chat.TestSchema.Container,List())),false,None,None,None,None,false,false,All(List()),AttributeMap(Map()))),None,true,None,None,None,None,false,false,All(List()),AttributeMap(Map())))))

Note the references to the implementation details of Scala List.

Start with the Scala reproduction using sttp.tapir.Schema and sttp.tapir.generic.auto._, then trace the schema derivation entry points for List[T] and companion-object types. Done means deriving Container and Root no longer exposes scala.collection.immutable.:: or other List implementation details in the generated schema.