I set up a serializer for SnapshotStateList, but it doesn't work

[little-creeper]

package models

import androidx.compose.runtime.MutableState
import androidx.compose.runtime.mutableStateListOf
import androidx.compose.runtime.snapshots.SnapshotStateList
import kotlinx.serialization.KSerializer
import kotlinx.serialization.Serializable
import kotlinx.serialization.builtins.ListSerializer
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder

@Serializable
data class Server(
    var id:Int,
    var name:MutableState<String>,
    @Serializable(with=SnapshotListSerializer::class) var urls: SnapshotStateList<Address>
)

class SnapshotListSerializer<T>(private val dataSerializer: KSerializer<T>) :
    KSerializer<SnapshotStateList<T>> {

    override val descriptor: SerialDescriptor = ListSerializer(dataSerializer).descriptor

    override fun serialize(encoder: Encoder, value: SnapshotStateList<T>) {
        encoder.encodeSerializableValue(ListSerializer(dataSerializer), value as List<T>)
    }

    override fun deserialize(decoder: Decoder): SnapshotStateList<T> {
        val list = mutableStateListOf<T>()
        val items = decoder.decodeSerializableValue(ListSerializer(dataSerializer))
        list.addAll(items)
        return list
    }
}

I was expecting to serialize/deserialize the SnapshotStateList, and a serializer was set, but I got an error

How do I fix this?

Exception in thread "AWT-EventQueue-0" kotlinx.serialization.SerializationException: Serializer for subclass 'SnapshotMutableStateImpl' is not found in the polymorphic scope of 'MutableState'.
Check if class with serial name 'SnapshotMutableStateImpl' exists and serializer is registered in a corresponding SerializersModule.
To be registered automatically, class 'SnapshotMutableStateImpl' has to be '@Serializable', and the base class 'MutableState' has to be sealed and '@Serializable'.
	at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:102)
	at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:114)
	at kotlinx.serialization.PolymorphicSerializerKt.findPolymorphicSerializer(PolymorphicSerializer.kt:109)
	at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:242)
	at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableElement(AbstractEncoder.kt:80)
	at models.Server.write$Self$TsTeA(Server.kt:16)
	at models.Server$$serializer.serialize(Server.kt:16)
	at models.Server$$serializer.serialize(Server.kt:16)
	at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:249)
	at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableElement(AbstractEncoder.kt:80)
	at kotlinx.serialization.internal.CollectionLikeSerializer.serialize(CollectionSerializers.kt:69)
	at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:249)
	at kotlinx.serialization.json.internal.JsonStreamsKt.encodeByWriter(JsonStreams.kt:31)
	at kotlinx.serialization.json.Json.encodeToString(Json.kt:81)
	at pages.mainpage.MainPageKt$MainPage$1$1$2$1$3.invoke(MainPage.kt:98)
	at pages.mainpage.MainPageKt$MainPage$1$1$2$1$3.invoke(MainPage.kt:49)
......

[sandwwraith]

You also need to provide a serializer for MutableState or its subclasses, because MutableState is an interface. See here: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#open-polymorphism