I have the following code which executes spring DatabaseClient insert logic:

 suspend fun saveXXX(xxx: XXX): InsertStatus {
        return try {
            doSave(xxx)
            InsertStatus.INSERTED
        } catch (exception: DuplicateKeyException) {
            val errDetails = (exception.cause as PostgresqlException).errorDetails
            if (errDetails.code == "23505") {
                val constraintName = errDetails.constraintName.get()
                if (constraintName == "unique_1") {
                    return InsertStatus.DUPLICATE_1
                } else if (constraintName == "unique_2") {
                    return InsertStatus.DUPLICATE_2
                }
            }
            return InsertStatus.UNKNOWN_ERROR
        }
    }

    private suspend fun doSave(xxx: XXX) {
        databaseClient
            .sql(
                """
                    SOME SQL
                """.trimIndent(),
            ).bind(...)
            .rowsUpdated()
            .awaitSingle()
    }

The problem that I face is during IntelliJ idea execution this code behaves as expected, so exception.cause is a subtype of PostgresqlException, but during gradle run with command ./gradlew clean build the exception.cause is wrapped around with another DuplicateKeyException, so essentialy the exception should be DuplicateKeyException(PostgresqlException) but effectively it is DuplicateKeyException(DuplicateKeyException(PostgresqlException)). And once again, this only happens during gradle run.

What could be the cause of this?