Undetected Self Referencing Discriminators

[parisholley]

Given the following mapping:

@Entity({ tableName: 'base', discriminatorColumn: 'type', abstract: true })
export default abstract class BaseMikro {
  @ManyToOne(() => BaseMikro, { fieldName: 'parentId', wrappedReference: true })
  parent: IdentifiedReference<ActivityMikro<any>>;
}

This is the compiled output function

  if (data.parent === null) {
    entity.parent = null;
  } else if (typeof data.parent !== 'undefined') {
    if (isPrimaryKey(data.parent, true)) {
      entity.parent = new Reference(factory.createReference('BaseMikro', data.parent, { merge: true, convertCustomTypes }));
    } else if (data.parent && typeof data.parent === 'object') {
      entity.parent = new Reference(factory.create('BaseMikro', data.parent, { initialized: true, merge: true, newEntity, convertCustomTypes }));
    }
  }

Given the following data

1: parent = null, type = 'Impl1'
2: parent = 1, type = 'Impl2'

When I run a query like the one below:

const implementations = em.find(BaseMikro, {});

assert(implementations[0] instanceof Impl1); // pass
assert(implementations[1] instanceof Impl2); // fail (is BaseMikro)

The generated code above doesn't seem to understand it is a discriminated class.

Versions

    "@mikro-orm/cli": "^4.5.9",
    "@mikro-orm/core": "^4.5.9",
    "@mikro-orm/migrations": "^4.5.9",
    "@mikro-orm/nestjs": "^4.3.1",
    "@mikro-orm/postgresql": "^4.5.9",
    "@mikro-orm/reflection": "^4.5.9",

[B4nan]

Please provide full reproduction for this, this is not enough to reproduce. For example this test basically checks the same.