Kirby Builder translate: false = field empty in frontend

If I set a field to translate: false the field is correctly greyed out in the translation.

BUT when I edit some other english field, the image is set to null and is missing in the frontend for the translation.

How can I fix this?

Kirby 3.3.6
Kirby Builder 2.0.15

blueprint:

name: Text (mit Bild)
tabs:
  texttab:
    label: Text
    fields:
      text:
        label: Text
        type: textarea
  imagetab:
    label: Bild
    fields:
      image:
        label: Bild
        type: files
        max: 1
        layout: cards
        translate: false # the image is missing in the translated frontend

Sounds as if it’s the same issue as reported here: https://github.com/getkirby/kirby/issues/1571#issuecomment-680000126?