@Parcelize in multi-platform project

Since Google deprecated android-kotlin-extensions plugin, you should use kotlin-parcelize plugin

apply plugin: 'kotlin-parcelize'

Source

Well that's a bit embarrassing, but I've figured out the problem was simply because I forgot to turn on the experimental features of kotlin-android-extensions, one of which is @Parcelize...

So to get it work, it was enough to keep my expected and actual definitions of Parcelable and Parcelize as in the question, and edit lib-android's build.gradle and add the following lines:

apply plugin: 'kotlin-android-extensions'
androidExtensions {
    experimental = true
}

No dependencies additions are needed; that was a dead end direction.