Problem with forSelf mapping (version 7.3.1)

[raptyk]

I'm trying to create map between classes:

Config

export const mapper = createMapper({
  name: 'someName',
  pluginInitializer: classes,
  namingConventions: new CamelCaseNamingConvention()
});

Source

export default class UserDto {
	email: string;
	userBriefcase: UserBriefcaseDto;
}

export default class UserBriefcaseDto {
	address: AddressDto;
	notes: NoteDto[];
}

export default class NoteDto {
	id: string;
	text: string;
}

Destination

export default class User {
   email: string;
   addrCity: string;
   addrStreet: string;
   addrStreetNumber: string;
   addrHouseNumber: string;
   addrPostalCode: string;
   notes: Note[];
}

export default class Note {
	id: string;
	text: string;
}

(1) Created map - manual mapping with forMember (working) ✔

mapper.createMap(UserDto, User)
    .forMember((dest)=>dest.notes, mapFrom((src) => src.userBriefcase.notes))

    .forMember((dest)=>dest.addrCity, mapFrom((src) => src.userBriefcase.address.city))
    .forMember((dest)=>dest.addrStreet, mapFrom((src) => src.userBriefcase.address.street))
    .forMember((dest)=>dest.addrStreetNumber, mapFrom((src) => src.userBriefcase.address.streetNumber))
    .forMember((dest)=>dest.addrHouseNumber, mapFrom((src) => src.userBriefcase.address.houseNumber))
    .forMember((dest)=>dest.addrPostalCode, mapFrom((src) => src.userBriefcase.address.postalCode));

(2) Created map - using forSelf (not working) ❌

mapper.createMap(UserDto, User)
    .forSelf(UserBriefcaseDto, (s) => s.userBriefcase) 
    // ⛔ generates error, but it should map NoteDto[] to Note[] (flatten userBriefcase.notes to self.notes) !!!

    .forMember((dest)=>dest.addrCity, mapFrom((src) => src.userBriefcase.address.city))
    .forMember((dest)=>dest.addrStreet, mapFrom((src) => src.userBriefcase.address.street))
    .forMember((dest)=>dest.addrStreetNumber, mapFrom((src) => src.userBriefcase.address.streetNumber))
    .forMember((dest)=>dest.addrHouseNumber, mapFrom((src) => src.userBriefcase.address.houseNumber))
    .forMember((dest)=>dest.addrPostalCode, mapFrom((src) => src.userBriefcase.address.postalCode));

Why version (2) with forSelf is not working ?
From what I understand in version (2) forSelf should map NoteDto[] to Note[] but I'm getting error:

Error: 
Error at "notes" on undefined ({"email":"[email protected]","firstName":"Patryk","lastName":"Test","uniqueId":"PT-111","birthDate":"2008-10-08T22:00:00Z","phoneNumber":"534534534"})
---------------------------------------------------------------------
Original error: TypeError: Cannot read properties of undefined (reading 'name')
Error at "notes" on undefined ({"email":"pt-testowy
unknown
setMember
C:/packages/core/src/lib/map/map.ts:203
  200 | * @param {TSource[]} sourceArray - the array of source items to map
  201 | * @param destination - destination meta key
  202 | * @param source - source meta key
> 203 | * @param {MapArrayOptions} options - the map options for this particular map operation
	  | ^  204 | * @param {Mapper} mapper - the mapper instance
  205 | * @param {ErrorHandler} errorHandler - error handler
  206 | */
View compiled
map
C:/packages/core/src/lib/map/map.ts:259

This is a simplified case but .forSelf I wanted to apply in many other similar places where I use [] and manually mapping each array using forMember is cumbersome.

I am getting more and more gray hair because of this error....
What am I doing wrong?