I have a laptop running Arch KDE. After boot, everything is normal. Once I close and reopen the lid, however, and the system returns from suspend, this issue comes up.

When I plug in or unplug the laptop, KDE's battery applet takes more than a minute to recognize the change in state. Additionally, the laptop takes many minutes to sleep when the lid is closed. The laptop's charging indicator updates instantly, and running

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cat /proc/acpi/button/lid/LID/state

while the lid is closed returns closed, so this is clearly not a hardware issue.

To me this seems related to how often KDE is checking hardware states. For some reason after returning from suspend hardware checks happen much less often.

I am stymied as to how to fix this. Any ideas would be appreciated.

I doubt it is a Plasma problem, more likely the underlying Linux system. You should report this to your distribution