DTH Child Devices isComponent:False

I’m referring to this. It used to work in the classic and new app. It broke in the new app last year; Google/Alexa cannot control them or discover new devices , if custom DTH has -

isComponent: false, componentName: “xxx”, componentLabel: “xxx”]

The doc is outdated and couldn’t find anything in the forum and I have to dig through the commits to find this (although it didn’t mention that it would break in 2020).