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The original reason why I suspected the decoration was because I noticed that the X11 windows for the decoration process leaked on the server (xwininfo -root -tree) which massively slowed down window searches.
But it seems the issue is really just that wobbling the decoration window during the exposé (does it still render the decos or are they skipped for more efficient screen estate usage?) hits a bogus path.
You'll still have to report this upstream for a proper bugfix.
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Done: https://bugs.launchpad.net/compiz/+bug/2060620 Thanks for your support!
Desktop: http://www.sysprofile.de/id15562, Arch Linux | Notebook: Thinkpad L13 Yoga Gen2, Manjaro
The very worst thing you can do with free software is to download it, see that it doesn't work for some reason, leave it, and tell your friends that it doesn't work. - Tuomas Lukka
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