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Your LimeSurvey version: Community Edition Version 6.2.9+230925
Own server or LimeSurvey hosting: own server
Survey theme/template: Any
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Strangely, LimeSurvey notifications, which can be accessed via the bell icon in the top right corner of the menu, work normally and appear in a form on the screen in one installation but not in another. On the other installation, I click on the notification to display it, but nothing happens (image 01), even though everything else seems to work fine. Also, in the problematic case, notifications are not deleted no matter how many times I press "Delete". They still show up as unread, but I cannot read them.
On the other installation, when I click on the notification (image 02), it shows up in a form (image 03)
Any advise will be most appreciated.

Some info about these installations:
A. The "normal" one
Operating system: Linux 4.15.0-213-generic #224-Ubuntu SMP
PHP version: 7.4.33
Web server software: Apache
Database: mysql
Database driver version: mysqlnd 7.4.33

B. The "problematic" one
Operating system: Linux 5.15.0-76-generic #83-Ubuntu SMP
PHP version: 8.1.2-1ubuntu2.14
Web server software: Apache/2.4.52 (Ubuntu)
Database driver: mysql
Database driver version: mysqlnd 8.1.2-1ubuntu2.14

 

Please file a bug report.