Custom serializer for third party enum does not propagate across packages

[bloonguyen1207]

Describe the bug

Custom serializer for third party enum does not propagate across packages

To Reproduce

I have package A, with a third-party enum that is not serializable, and I want to serialize it by enum value, so I wrote a custom serializer for it in package A.

package com.third.party

enum class ThirdPartyEnum(val name: String) {
  TEST_1("test1")
  TEST_2("test2")
}

package com.a

import com.third.party.ThirdPartyEnum

object ThirdPartyEnumSerializer : KSerializer<ThirdPartyEnum> {
    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("ThirdPartyEnum", PrimitiveKind.STRING)

    override fun serialize(encoder: Encoder, value: ThirdPartyEnum) {
        return encoder.encodeString(value.name)
    }

    override fun deserialize(decoder: Decoder): ThirdPartyEnum {
        return fromShortName(decoder.decodeString())!!
    }
}

@Serializable
data class TestObject(
  @Serializable(with = ThirdPartyEnumSerializer::class)
  val enumEntry1: ThirdPartyEnum,
  @Serializable(with = ThirdPartyEnumSerializer::class)
  val enumEntry2: ThirdPartyEnum
)

fun main() {
  val obj = TestObject( 
      enumEntry1 = ThirdPartyEnum.TEST_1,
      enumEntry2 = ThirdPartyEnum.TEST_2
  )
  
  println(Json.encodeToString(TestObject.serializer()), obj)
  // Prints "{"enumEntry1": "test1", "enumEntry2": "test2"}"
}

I then implement package A in package B and try to encode TestObject as string

  implementation(project(":package-a")
  implementation("com.third.party:x.x.x")

  val obj = TestObject( 
      enumEntry1 = ThirdPartyEnum.TEST_1,
      enumEntry2 = ThirdPartyEnum.TEST_2
  )
  println(Json.encodeToString(TestObject.serializer()), obj)
  // Prints "{"enumEntry1": "TEST_1", "enumEntry2": "TEST_2"}"

Expected behavior

Json.encodeToString in package B should produce the same result as package A

Environment

• Kotlin version: 1.9.10
• Library version: 1.6.0
• Kotlin platforms: JVM
• Gradle version: 7.6.3

[sandwwraith]

Custom serializers are compiled into the code of TestObject.serializer(), so they shouldn't be affected whether they're used from the same module or as a binary dependency. Can you please re-check that you're using a proper dependency version and that it is not affected by e.g. incremental compilation or Gradle cache?