`kotlinx.serialization.MissingFieldException` crash when using `decodeFromJsonElement()`

Describe the bug given the same json as input, when trying to deserialize to the following class structure, I get a kotlinx.serialization.MissingFieldException crash when using decodeFromJsonElement() as seen in the code example.

Here are the relevant data structures:

@Serializable
abstract class Resource {
    abstract val id: String
}

@Serializable
@SerialName("typeClassWithCyclicRelationship")
data class ClassWithCyclicRelationship(
    override val id: String,
    val field: Int,
    val parentRelationship: ClassWithCyclicRelationship?,
) : Resource()

global method

fun jsonFormat(
    setupSerializerModule: (SerializersModuleBuilder.() -> Unit)? = null,
) = Json {
    ignoreUnknownKeys = true
    explicitNulls = false
    serializersModule = SerializersModule {
        setupSerializerModule?.let { it() }
    }
}

test class that highlights the two cases

class JsonAPIDocumentTest {
private lateinit var json: Json

    @BeforeTest
    fun setup() {
        json = jsonFormat {
            polymorphic(Resource::class) {
                subclass(ClassWithCyclicRelationship::class)
            }
        }
    }

    @Test
    fun `decodingFromJsonElement crashes if there is a null parent reference`() {
        val transformedJSONDataObject = JsonObject(mapOf(
            "type" to JsonPrimitive("typeClassWithCyclicRelationship"),
            "id" to JsonPrimitive("1"),
            "field" to JsonPrimitive("123"),
            "parentRelationship" to JsonObject(mapOf(
                "type" to JsonPrimitive("typeClassWithCyclicRelationship"),
                "id" to JsonPrimitive("2"),
                "field" to JsonPrimitive("456"),
                "parentRelationship" to JsonNull
            )),

        ))

        val output = json.decodeFromJsonElement(Resource.serializer(), transformedJSONDataObject)

        assertEquals(
            ClassWithCyclicRelationship(
                id = "1",
                field = 123,
                parentRelationship = ClassWithCyclicRelationship(
                    id = "2",
                    field = 456,
                    parentRelationship = null,
                ),
            ),
            output,
        )
    }

    @Test
    fun `decodingFromJsonString works just fine given the exact same structure!`() {
        val transformedJSONDataObject = JsonObject(mapOf(
            "type" to JsonPrimitive("typeClassWithCyclicRelationship"),
            "id" to JsonPrimitive("1"),
            "field" to JsonPrimitive("123"),
            "parentRelationship" to JsonObject(mapOf(
                "type" to JsonPrimitive("typeClassWithCyclicRelationship"),
                "id" to JsonPrimitive("2"),
                "field" to JsonPrimitive("456"),
                "parentRelationship" to JsonNull
            )),

            ))

        val output = json.decodeFromString(Resource.serializer(),transformedJSONDataObject.toString())

        assertEquals(
            ClassWithCyclicRelationship(
                id = "1",
                field = 123,
                parentRelationship = ClassWithCyclicRelationship(
                    id = "2",
                    field = 456,
                    parentRelationship = null,
                ),
            ),
            output,
        )
    }
}

Full stacktrace

Fields [id, field, parentRelationship] are required for type with serial name 'typeClassWithCyclicRelationship', but they were missing
kotlinx.serialization.MissingFieldException: Fields [id, field, parentRelationship] are required for type with serial name 'typeClassWithCyclicRelationship', but they were missing
    at app//kotlinx.serialization.internal.PluginExceptionsKt.throwMissingFieldException(PluginExceptions.kt:20)
    at app//com.peakon.network.jsonapi.ClassWithCyclicRelationship.<init>(TestResources.kt:135)
    at app//com.peakon.network.jsonapi.ClassWithCyclicRelationship$$serializer.deserialize(TestResources.kt:135)
    at app//com.peakon.network.jsonapi.ClassWithCyclicRelationship$$serializer.deserialize(TestResources.kt:135)
    at app//kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:61)
    at app//kotlinx.serialization.json.internal.AbstractJsonTreeDecoder.decodeSerializableValue(TreeJsonDecoder.kt:52)
    at app//kotlinx.serialization.internal.TaggedDecoder.decodeSerializableValue(Tagged.kt:207)
    at app//kotlinx.serialization.internal.TaggedDecoder$decodeNullableSerializableElement$1.invoke(Tagged.kt:289)
    at app//kotlinx.serialization.internal.TaggedDecoder.tagBlock(Tagged.kt:297)
    at app//kotlinx.serialization.internal.TaggedDecoder.decodeNullableSerializableElement(Tagged.kt:288)
    at app//com.peakon.network.jsonapi.ClassWithCyclicRelationship$$serializer.deserialize(TestResources.kt:135)
    at app//com.peakon.network.jsonapi.ClassWithCyclicRelationship$$serializer.deserialize(TestResources.kt:135)
    at app//kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:61)
    at app//kotlinx.serialization.json.internal.AbstractJsonTreeDecoder.decodeSerializableValue(TreeJsonDecoder.kt:52)
    at app//kotlinx.serialization.json.internal.TreeJsonDecoderKt.readPolymorphicJson(TreeJsonDecoder.kt:33)
    at app//kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:71)
    at app//kotlinx.serialization.json.internal.AbstractJsonTreeDecoder.decodeSerializableValue(TreeJsonDecoder.kt:52)
    at app//kotlinx.serialization.json.internal.TreeJsonDecoderKt.readJson(TreeJsonDecoder.kt:25)
    at app//kotlinx.serialization.json.Json.decodeFromJsonElement(Json.kt:117)
    at app//com.peakon.network.jsonapi.JsonAPIDocumentTest.decodingFromJsonElement crashes if there is a null parent reference(JsonAPIDocumentTest.kt:201)
    at java.base@17.0.6/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base@17.0.6/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at java.base@17.0.6/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.base@17.0.6/java.lang.reflect.Method.invoke(Unknown Source)
    at app//org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at app//org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at app//org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at app//org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at app//org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at app//org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at app//org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at app//org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at app//org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at app//org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at app//org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at app//org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at app//org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:108)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:40)
    at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:60)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:52)
    at java.base@17.0.6/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base@17.0.6/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at java.base@17.0.6/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.base@17.0.6/java.lang.reflect.Method.invoke(Unknown Source)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
    at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
    at jdk.proxy2/jdk.proxy2.$Proxy5.processTestClass(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
    at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
    at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
    at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
    at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
    at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

Expected behavior That decodeFromJsonElement() behaves the same as decodeFromString().

Environment

Kotlin version: 1.8.21
Library version: 1.5.0
Kotlin platforms: KMM/Android
Gradle version: 8.0.0

Kotlin / kotlinx.serialization

`kotlinx.serialization.MissingFieldException` crash when using `decodeFromJsonElement()` #2448