Hi @Garth_AZ ,
There are no official changes for image formats but there will be definitely changes in UI and theme framework updates.
Because we also faced similar issues in our portals after some of our upgrades that the functionality used to work earlier but failed after upgrade. This could be mainly because of the framework changes. You can find the corresponding widget & raise a case with ServiceNow & ask them exactly if they can help. We did the same & they helped us fix the issue in portal.
If you find this response helpful, please mark it as Accepted.
Best Regards,
Madhan.
