So I've set this up:

// COMMON MAIN
expect annotation class Parcelize()
expect interface Parcelable

// JVM MAIN
actual interface Parcelable
actual annotation class Parcelize actual constructor()

// ANDROID MAIN
actual typealias Parcelize = kotlinx.parcelize.Parcelize
actual interface Parcelable : android.os.Parcelable

I can pass objects between Activities/Fragment without a problem, but when my Fragment gets stopped, or if I try to call

writeToParcel

myself, my app crashes:

java.lang.AbstractMethodError: abstract method "void android.os.Parcelable.writeToParcel(android.os.Parcel, int)"

Any idea?

sounds like a bug. https://developer.android.com/kotlin/parcelize#feedback

I've reported the bug, thanks