I've going to test 4.18.11 (went back to .10 as that is what I upgraded from) and some Linux LTS kernel versions in the next few minutes to see how widespread the bug is. Is anybody else experiencing this?
EDIT: It's worth noting that I can see the same issues reflected in both the GUI power management applets as well as the output from the acpi command line utility.
EDIT 2: linux-lts 4.14.74 appears to be unaffected.
EDIT 3: linux 4.18.11 appears to be unaffected.
EDIT 4: linux 4.18.12 now also appears to be unaffected. Perhaps my replication steps are in error. Hmmmmm....
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