MyActivity shows all play store apps and some non-store, pre-installed apps for me, e.g. the system launcher and WiFi drivers, but it does not show sideloaded a

MyActivity shows all play store apps and some non-store, pre-installed apps for me, e.g. the system launcher and WiFi drivers, but it does not show sideloaded apks. If this story turns out to be what it seems, that might mean Google shows you only a subset of the app activity log that they actually keep, adding another layer of intransparency to the injustice.