Get the original geometry

Revit
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1

i can’t get the original geometry, it’s just the geometry after join, what i miss here
also know that GetOriginalGeometry(Options) gonna work but i want to follow this way to study
trying to Unjoin → get Geometry → convert to Dynamo Type → Rollback (back before UnJoin)

clr.AddReference('RevitAPI')
clr.AddReference('RevitServices')
clr.AddReference('RevitNodes')
clr.AddReference('ProtoGeometry')
import Revit
import Autodesk.DesignScript.Geometry as DSGeometry
clr.ImportExtensions(Revit.GeometryConversion)
clr.ImportExtensions(Revit.Elements)
from Autodesk.Revit.DB import *
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

# Lấy tài liệu hiện tại
doc = DocumentManager.Instance.CurrentDBDocument

# Hàm lấy hình dạng gốc của các element
def get_original_geometry(element):
    options = Options()
    revit_geometry = element.get_Geometry(options)
    dynamo_geometries = []

    for geom in revit_geometry:
        if isinstance(geom, GeometryInstance):
            instance_geometry = geom.GetInstanceGeometry()
            for inst_geom in instance_geometry:
                dynamo_geom = inst_geom.ToProtoType()
                if dynamo_geom is not None:
                    dynamo_geometries.append(dynamo_geom)
        else:
            dynamo_geom = geom.ToProtoType()
            if dynamo_geom is not None:
                dynamo_geometries.append(dynamo_geom)
    return dynamo_geometries

element = UnwrapElement(IN[0]) 

original_geometries = []
TransactionManager.Instance.EnsureInTransaction(doc)

trans = SubTransaction(doc)
trans.Start()

try:
    joined_elements = JoinGeometryUtils.GetJoinedElements(doc, element)
    for joined_element_id in joined_elements:
        joined_element = doc.GetElement(joined_element_id)
        JoinGeometryUtils.UnjoinGeometry(doc, element, joined_element)
    original_geometries.extend(get_original_geometry(element))

    trans.RollBack()
except Exception as e:
    trans.RollBack()
TransactionManager.Instance.ForceCloseTransaction()
OUT = original_geometries

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