First session of Plasma 6 after update was unstable

[TraceyC77]

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• [X] I have searched open bugs for this issue

Summary

After performing a system update and rebooting, the first Plasma 6 session was unstable

Steps to reproduce

1. Update the system (I used eopkg)
2. Reboot
3. Go into taskbar settings and disable the Floating toggle, exit Edit mode
4. Launch Firefox, mouse over icons in the task bar

Expected result

Things work normally

Actual result

• Every icon I moused over disappeared. This was both in the task tray and the "Icons-only tray manager".
• I clicked on what I thought was the Thunderbird icon in the tray manager. Firefox crashed.
• I restarted Firefox, but it crashed again when clicking on its icon in the tray manager

Environment

• [X] Is system up to date?

Repo

Unstable

Desktop Environment

Plasma

System details

Operating System: Solus 4.5 KDE Plasma Version: 6.0.2 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2 Kernel Version: 6.6.21-280.current (64-bit) Graphics Platform: X11 Processors: 16 × 11th Gen Intel® Core™ i7-11800H @ 2.30GHz Memory: 62.5 GiB of RAM Graphics Processor: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 Manufacturer: Dell Inc. Product Name: XPS 17 9710

Other comments

I had rebooted after these issues were seen. Firefox and the taskbar are working normally now. I can't reproduce the issue going back into tray edit mode and toggling the Floating preference (on or off)

This was not a problem on my Flex where I had updated to Plasma 6 from 5 via the private repo.