Magnolia DX Version: 6.1.1
Dam Responsive-Image Version: 1.1.4

How to reproduce:
Upload an image in the assets-app. Before saving switch language. e.g. from english to german.

FocalAreasFieldTransformer throws an java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long in line 62. Thus i18n-fields like title, description ... are not saved except in the default language.

dam-images-responsive configuration:

'config':
    jcr:primaryType: 'mgnl:content'
    'variationSets':
        'dam':
            'cubic':
               'minHeight': '2000'
               'minWidth': '2000'
               'ratio': '1/1'
   'editorConfig':
      'maxHeight': '1080'
      'maxWidth': '1920'