Saving a configuration, while having a custom logo uploaded in the Icon field will break the logo

I can not directly reproduce the issue in my dev environment, but I get an error, that the uploaded file isn't referenced anywhere, which leads to not being able to save the configuration at all:

The file used in the Upload image field may not be referenced.

The provided MR fixes the issue, but the fake file usage feels filthy...

Unsure how to proceed from here. @Anybody, what do you suggest? The error triggers in line 443 of "/core/modules/file/src/Element/ManagedFile.php" and completely prevents the form submition, so we have to find a fix here.

Ok, great now I can replicate the original issue in my dev environment.

Setting this to "Major", as not only the image preview will be removed, but furthermore the manifest.json won't be using the uploaded image anymore, but instead uses the fallback image provided with the module.

Fixed! The problem was, that $form_state->getValue('image_fid') returned an id string and $config->get('image_fid') a number, meaning this if case here:

    // If a new image is uploaded, we need to delete the old ones:
    if ($config->get('image_fid') !== $imageId) {
      $this->manifest->deleteImages();
    }

Always resulted in TRUE, deleting the images on each form submit. Please review!