Bug 460843

SUMMARY
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In 30-40% of time, when starting the system, the upper panel with systray, appmenu, title and buttons has composition off. In the result, all transparency settings are not working, and the panel is fully opaque. In the same time, the dock with quicklaunch and start is behaving correctly. In order to fix that, I have to close latte and restart it. In 99% cases it opens it with transparent panel (as per settings). Once I even deleted the panel and created it anew and the panel had transparency, so latte doesn't have to be restarted to regain composition (transparency) effect. However, when trying to change settings in a current, not-transparent panel, they simply don't work and there is no reaction from the panel, showing that following settings is compromised, not the composition itself.
The random nature of this bug suggests some race conditions during startup. Only once or twice it happened that after manual restart the transparency wasn't fixed. The issue is present over 6-10 months, so there were hundreds of startups.
I tried to change from git version to the repo version (Manjaro) but the issue was present there as well.
After some bigger Plasma updates, I always recompile widgets: appmenu, title and buttons, along with the latte-dock. Unfortunately, this only lowers the chance of this bug happening, but not preventing it.

Frankly, this is a highly annoying bug. I just can't stand it and have to manually close and start latte every time it happens. When the bug is happening every day, I do this every day. Latte starts to feel like a chore.

Additionally, when there is a secondary monitor, sometimes the panel on the primary or secondary screen also looses transparency. This is the same panel, because it is set to be cloned on all monitors (so there is no separate panel).
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STEPS TO REPRODUCE
1. Have upper panel with: buttons, title, appmeny, systray.
2. Start the system. Sometimes everything is OK, sometimes not. Sometimes the transparency is gone almost most of the time I start the system, sometimes it can be days till I get this issue.
3. 

OBSERVED RESULT

The upper panel is not transparent.

EXPECTED RESULT

The upper dock should be transparent.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.26.1
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.2-3-MANJARO (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 530
Manufacturer: Alienware
Product Name: Alienware 17 R3
System Version: 1.13.1 

ADDITIONAL INFORMATION