How can I chain generic implicits in Scala?

Question

There is this post that discusses chaining of implicits but I think it doesn't cover my case because I have generic implicits. Sample project that demonstrates the issue is located here. To reproduce these two lines should be commented out.

So I have number of implicits vals for concrete types such as

implicit val ObjectIdColumnType: ColumnType[ObjectId] = MappedColumnType.base[ObjectId, Array[Byte]](
      { obj => obj.toByteArray }, { arr => new ObjectId(arr) }
    )

I'd like all of them automagically produce GetResult[T] implicit vals. Thus I wrote following function

implicit def getResultForTypedTypes[T](implicit bct: ColumnType[T]): GetResult[T] =
  GetResult[T](r => bct.getValue(r.rs, r.currentPos))

and I expect that function with prototype such as

def << [T](implicit f: GetResult[T]): T = f(this)

would be able to pick up GetResult[ObjectId]

Sadly I get error

Error:(78, 20) could not find implicit value for parameter f: slick.jdbc.GetResult[org.bson.types.ObjectId]
      val id = r.<<[ObjectId]
                   ^

I enabled log-implicits and found that seemingly unrelated implicit gets in a way

Information:(78, 20) getResultForTypedTypes is not a valid implicit value for slick.jdbc.GetResult[org.bson.types.ObjectId] because:
hasMatchingSymbol reported error: ambiguous implicit values:
 both value strListTypeMapper in object MyAPI of type => co.greenhouse.rabbit.server.db.MyPostgresDriver.DriverJdbcType[List[String]]
 and value ObjectIdColumnType in object MyAPI of type => co.greenhouse.rabbit.server.db.MyPostgresDriver.BaseColumnType[org.bson.types.ObjectId]
 match expected type co.greenhouse.rabbit.server.db.MyPostgresDriver.api.BaseColumnType[T]
      val id = r.<<[ObjectId]
                   ^

How can I find the issue in this spaghetti of implicits ?