SUMMARY
Sometimes I am unable to revisit the notification history again after clicking on it once. Clicking the "Show hidden icons" arrow in the tray and clicking Notifications does nothing. This usually happens right after the Notifications tray button goes from Visible to Hidden after clicking on it once.

STEPS TO REPRODUCE
1. (Not sure if necessary, but it's what's on my setup) Make sure Notifications is set to "Shown when relevant" in the System Tray settings
2. Trigger a notification to come in. I did this with Gmail browser notifications
3. Click on the Notification bell icon that appears in the Tray
4. Dismiss the notification history pane. Notification bell should go back into hidden
5. Click on the "Show hidden icons" arrow
6. Click on the Notifications bell

OBSERVED RESULT
Nothing happens when clicking on Notifications bell

EXPECTED RESULT
Clicking on notifications bell should show history

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.8.9-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 24 × AMD Ryzen 9 3900X 12-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3090/PCIe/SSE2
Product Name: X570 Taichi