Dismissible notification feature stops working in 5.x latest and SP 6.5.18+

[janpop]

Required Information

• AEM Version, including Service Packs, Cumulative Fix Packs, etc: AEM 6.5.20 (on-premise)
• ACS AEM Commons Version: 5.x latest
• Reproducible on Latest? yes

Expected Behavior

Creating a dismissible notification: Notification can be dismissed and will not show up for user after he clicks on the dismiss button.

Actual Behavior

With latest 5.x ACS Commons and AEM SP 6.5.20 notifications can not be dismissed and re-appear with every page load

Steps to Reproduce

How to reproduce:
1.) Create a AEM 6.5 installation from scratch
2.) Install ACS Commons 5.x latest
3.) Create a notification a see that it can be dismissed
4.) Install SP 6.5.15 => [/] Notifications can still be dismissed
5.) Install SP 6.5.18 => [x] Notifications cannot be dismissed anymore, they re-appear with every page load
BTW: SP 6.5.20 does not solve the issue.

Links

Links to related assets, e.g. content packages containing test components

[janpop]

The issue is really annoying. Can someone please have a look.