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SUMMARY
I think this issue started with Qt 6.10, not after updating to Plasma 6.5 Beta, but I'm not 100% sure.

Notifications do not close automatically after a while as they used to. Moving the mouse on top of them starts the "countdown progress bar" to close them, but when it finishes nothing happens. They only way to remove the notifications is by manually using the close button.


STEPS TO REPRODUCE
1. For example, download a PDF using Firefox (I have the Plasma integration extension enabled)
2. After download completes, the "countdown progress bar" in the notification starts. It finishes in a few seconds.
3. Notification remains there forever unless manually closed.

OBSERVED RESULT
Notifications are never closed with the latest version of Qt and Beta release of Plasma 6.5.

EXPECTED RESULT
Notifications should close automatically when appropriate as before.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.4.91
KDE Frameworks Version: 6.18.0
Qt Version: 6.10.0
Kernel Version: 6.17.1-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 22 × Intel® Core™ Ultra 7 155H
Memory: 32 GiB of RAM (30.9 GiB usable)
Graphics Processor: Intel® Arc
Manufacturer: LENOVO
Product Name: 21KDS00600
System Version: ThinkPad X1 Carbon Gen 12

ADDITIONAL INFORMATION
Here is a video showing an example of the issue:
https://drive.switch.ch/index.php/s/jr1cfqmvvviKZ3Y