Why does django's ContentFile save an empty file?

Question

Django

When saving an image like this:

import base64
from django.core.files.base import ContentFile

Image.objects.create(image=ContentFile(base64.b64decode(data), name="somename.jpg"))

The empty file somename.jpg is saved (to which, by the way, the image refers) and the file with the image itself, but under a different name (somename_DJgsdhg.jpg for example).
It is necessary, accordingly, that no empty files are saved, only the target image.

How can this be fixed?