Deserializing, Transitient field use default value ​​instead of the values ​​from subclass constructor

[Gargantua7]

Describe the bug

When deserializing, Transit field of parent class use its default value ​​instead of the value ​​from subclass constructor

To Reproduce

@Serializable
sealed class Parent(
   @Transient val foo: Long = 0L
)

@Serializable
data class Child(
    val anything: Unit = Unit
): Parent(System.currentTimeMillis())


// main
Json.encodeToString<Parent>(Child()).apply {
    println(this)
    Json.decodeFromString<Parent>(this).apply {
        println(this)
        println(this.foo)
    }
}

In my actual business, foo will be some dynamic values, each subclass is different, and even the type may be different, so I used @Transitient, and passed in the corresponding value when the subclass constructor called the parent class constructor, but after deserialization, the default value of the parent class was directly used.

{"type":"Child"}
Child(anything=kotlin.Unit)
0

Expected behavior

It should use value from subclass constructor

{"type":"Child"}
Child(anything=kotlin.Unit)
[Now timestamp]

Environment

• Kotlin version: 2.0.20-RC
• Library version: 1.6.0
• Kotlin platforms: JVM/Android
• Gradle version: 8.7
• IDE version (if bug is related to the IDE) IntelliJ IDEA 2024.2/Android Studio Koala 2024.1 Patch 2