Steps to reproduce

1. Install Ibexa DXP
2. create a migration file

-
    type: language
    mode: create
    metadata:
        languageCode: pl_PL
        name: 'Pol'
        enabled: true
    references:
        -   name: language_pl
            type: language_id

-
    type: reference
    mode: save
    filename: 'references.yaml' 

1.  run a command php bin/console ibexa:migrations:migrate

Result

Migration created references.yaml but this file is empty

Expected

File references.yaml should contain references to created language

Note

In the migration bundle, we don't have a references resolver for language