Hello Zack,
Thank you for the heads up. We have just updated the documentation to provide valid profile image URLs: [node:10796]. We also added a note about outdated profile images, which I think is the issue you are currently encountering.
Could you please make sure that the user objects you are extracting profile_image_url_https from are up-to-date by calling [node:10320]?
Please let us know if you have any other questions or issues.