Users have updated their photo in their user profile but they do not reflect on the avatar next to their names in visual task boards
Release or Environment
This is due to the thumbnail file which is not found. If you check in the browser console, you may see the following after opening https://<instance_name>.service-now.com/<sys_id>.iix?t=small compared to https://<instance_name>.service-now.com/<sys_id>.iix
One possible cause for this is a custom before insert/update business rule on the sys_attachment table.
Disable any custom before insert/update business rule.