Is this known and expected behavior?
Yes, that is how the plugin-interface works. It does not bother me, as I never power off except for loading the plugin.ini after making changes. My impression is, that the pros in convenience for only using sleep mode outweigh the slightly higher powerconsumption by far. Considering that the difference probably is about 1 day more or less in several weeks until needing to charge for a few hours I will definitely use power off only for means of reboot for technical reasons.