femanager_edit: changing image only does not work

[nabossha]

using the edit-form and working with user-image the following behaviour is observed using TYPO3 12.4.9 and femanager 8.0.1:

• adding or changing an image and NOT changing any fields (eg. firstName / lastName etc) does NOT change the image
• adding or changing an image and CHANGING a value in any other field correctly adds/changes the user image

expected behaviour:
the user-iamge can be added/changed without the need to change any additional user-data

selected fields for the femanager_edit element:

Is this a known bug or may there be another cause for this?