Most attributes for fragments within the Content Page Editor are segmented (actual values, images, spacing configuration, etc.). However this one is not segmented. Meaning that a user might experiment undesired experience changes propagation for this.
Besides that, the alt attribute is included among this attributes, and having a different alt (not segmented) for different images (segmented) could be a common use case.
There are some image attributes that are segmented, like the `src`. However there are many others that are not, such as `title`, `alt` and potentially many others.