Unreliable serialization in output string (kotlinx date time types)

Describe the bug When I try to serialize an instance of this object with kotlinx serialization, the resulting string is inconsistent, sometimes (very rarely) it outputs test0 and test1 fields in the output, but more often than not those fields are not in the result as if they were null ?

Also while debugging these two fields are considered optional (elementsOptionality field) in the generated serializer class, so is id field but this is expected

To Reproduce Simply deserialize this class

@Serializable data class TestX( val id: String? = null, val code: Int, val reason: String, val message: String?, val test0: LocalDateTime = LocalDateTime(2020, 5, 20, 17, 0, 0) ) { val test1 = Clock.System.now() }

and then val jsonString = Json.encodeToString(test)

Expected behavior

Environment

• Kotlin version: 1.5.22
• Library version: 1.2.2, datetime version: 0.2.1
• Kotlin platforms: JVM
• Maven 3

[master-bytes-krafter]

For now as a workaround i initialize these fields in the init block,

[master-bytes-krafter]

Ok all good for me, thank you