This is from JDReborn discord servers, solution to JD plot quest bugs. Works with client v323.
CompeR -- 01/03/2022
@JD-Official v323: Workaround/fix were applied for JD Plot Jadeon - Old Haunt. Note: Client patch is required to trigger this quest AND it will only work on Realm 7(till next proper patch). This is only about Main Reborn Server, Kunlun and Inferna have to wait till next maintenance. (edited)