Need Help on Issue with Career Section branding file extension impacted by Taleo 21C upgrade

Hi Experts,

Need a help in fixing the issue on Taleo Career portal. Due to recent 21C upgrade work profile icon is missing and different icon as shown in the below screen shot.

Functionality wise it is working fine and also we noticed issue is not consistent for all the users. Some users are able to see proper icon but others are not. User has cleared cache and did all preliminary checks and fixes but not able to fix this issue.

No clue on the root cause of this issue. We think that this issue is due to branding file extension. We are unable to fix this issue for now and looking for quick help on this.