Scaladoc fails to include protected members of enum classes or case classes/objects

[katrinafyi]

Compiler version

tested 3.7.1, 3.3.6

Minimized code

sealed trait Trait {
  // documented:
  protected def protect(): Int = ???
  protected type T = Int
}

class Class {
  // documented:
  protected def protect(): Int = ???
  protected type T = Int
}

enum Enum {
  case E1()
  case E2

  // NOT documented:
  protected type T = Int
  protected def protect(): Int = ???
}

case class CaseClass() {
  // NOT documented:
  protected def protect(): Int = ???
  protected type T = Int
}


case object CaseObject {
  // NOT documented:
  protected def protect(): Int = ???
  protected type T = Int
}

object MainObject {
  @main def main(): Unit = ()
}

Output

observe that the protected members marked "NOT documented" are missing from the documentation, contrary to the default behaviour described in the scaladoc -help:

                -private  Show all types and members. Unless specified, show only public and protected types and
                          members.

Screenshots:

Expectation

the documentation should be accurate and these members should be visible by default in the scaladoc output. in any case, it is also very surprising that only some protected members are currently shown.

possibly related to #18946