I have exported this code from Graphic Modeler of QGIS as a python script. The Model is outputting the final result as CN_Grid, as it should, but the script of the same model is giving results as Remaining fields. Is there something I am doing wrong?

from qgis.core import QgsProcessing
from qgis.core import QgsProcessingAlgorithm
from qgis.core import QgsProcessingMultiStepFeedback
from qgis.core import QgsProcessingParameterVectorLayer
from qgis.core import QgsProcessingParameterBoolean
from qgis.core import QgsProcessingParameterFeatureSource
from qgis.core import QgsProcessingParameterRasterLayer
from qgis.core import QgsProcessingParameterFeatureSink
from qgis.core import QgsProcessingParameterDefinition
import processing


class Cn_grid(QgsProcessingAlgorithm):

    def initAlgorithm(self, config=None):
        self.addParameter(QgsProcessingParameterVectorLayer('areaboundary', 'Area Boundary', types=[QgsProcessing.TypeVectorPolygon], defaultValue=None))
        self.addParameter(QgsProcessingParameterRasterLayer('nlcdlandcoverimgfile', 'NLCD Land Cover .img File', defaultValue=None))
        self.addParameter(QgsProcessingParameterVectorLayer('soilfilesoilmuaaoi', 'Soil File [soilmu_a_aoi]', types=[QgsProcessing.TypeVectorPolygon], defaultValue=None))
        self.addParameter(QgsProcessingParameterFeatureSource('hsglookupcsv2', 'HSG Lookup .csv', types=[QgsProcessing.TypeVector], defaultValue=None))
        param = QgsProcessingParameterBoolean('drainedsoilsleaveuncheckedifnotsure', 'Drained Soils? [leave unchecked if not sure]', defaultValue=False)
        param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
        self.addParameter(param)
        self.addParameter(QgsProcessingParameterFeatureSink('Cn_grid', 'CN_Grid', type=QgsProcessing.TypeVectorAnyGeometry, createByDefault=True, defaultValue=None))

    def processAlgorithm(self, parameters, context, model_feedback):
        # Use a multi-step feedback, so that individual child algorithm progress reports are adjusted for the
        # overall progress through the model
        feedback = QgsProcessingMultiStepFeedback(11, model_feedback)
        results = {}
        outputs = {}

        # Buffer
        alg_params = {
            'DISSOLVE': False,
            'DISTANCE': 120,
            'END_CAP_STYLE': 0,
            'INPUT': parameters['areaboundary'],
            'JOIN_STYLE': 0,
            'MITER_LIMIT': 2,
            'SEGMENTS': 5,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['Buffer'] = processing.run('native:buffer', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(1)
        if feedback.isCanceled():
            return {}

        # Clip raster by extent
        alg_params = {
            'DATA_TYPE': 0,
            'INPUT': parameters['nlcdlandcoverimgfile'],
            'NODATA': None,
            'OPTIONS': '',
            'PROJWIN': outputs['Buffer']['OUTPUT'],
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['ClipRasterByExtent'] = processing.run('gdal:cliprasterbyextent', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(2)
        if feedback.isCanceled():
            return {}

        # Raster pixels to polygons
        alg_params = {
            'FIELD_NAME': 'VALUE',
            'INPUT_RASTER': outputs['ClipRasterByExtent']['OUTPUT'],
            'RASTER_BAND': 1,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['RasterPixelsToPolygons'] = processing.run('native:pixelstopolygons', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(3)
        if feedback.isCanceled():
            return {}

        # Dissolve
        alg_params = {
            'FIELD': 'Value',
            'INPUT': outputs['RasterPixelsToPolygons']['OUTPUT'],
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['Dissolve'] = processing.run('native:dissolve', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(4)
        if feedback.isCanceled():
            return {}

        # Intersection
        alg_params = {
            'INPUT': parameters['soilfilesoilmuaaoi'],
            'INPUT_FIELDS': 'MUSYM',
            'OVERLAY': outputs['Dissolve']['OUTPUT'],
            'OVERLAY_FIELDS': 'VALUE',
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['Intersection'] = processing.run('native:intersection', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(5)
        if feedback.isCanceled():
            return {}

        # Join attributes by field value
        alg_params = {
            'DISCARD_NONMATCHING': False,
            'FIELD': 'MUSYM',
            'FIELDS_TO_COPY': 'HSG',
            'FIELD_2': 'MUSYM',
            'INPUT': outputs['Intersection']['OUTPUT'],
            'INPUT_2': parameters['hsglookupcsv2'],
            'METHOD': 1,
            'PREFIX': '',
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['JoinAttributesByFieldValue'] = processing.run('native:joinattributestable', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(6)
        if feedback.isCanceled():
            return {}

        # Field calculator
        alg_params = {
            'FIELD_LENGTH': 5,
            'FIELD_NAME': 'GDCodeTemp',
            'FIELD_PRECISION': 3,
            'FIELD_TYPE': 2,
            'FORMULA': '\"Value\" || \"HSG\"',
            'INPUT': outputs['JoinAttributesByFieldValue']['OUTPUT'],
            'NEW_FIELD': True,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['FieldCalculator'] = processing.run('qgis:fieldcalculator', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(7)
        if feedback.isCanceled():
            return {}

        # Field calculator2
        alg_params = {
            'FIELD_LENGTH': 5,
            'FIELD_NAME': 'GDCode',
            'FIELD_PRECISION': 3,
            'FIELD_TYPE': 2,
            'FORMULA': 'if( var(\'drainedsoilsleaveuncheckedifnotsure\') = True,replace(\"GDCodeTemp\", \'/D\', \'\'),replace(\"GDCodeTemp\", map(\'A/\', \'\', \'B/\', \'\', \'C/\', \'\')))',
            'INPUT': outputs['FieldCalculator']['OUTPUT'],
            'NEW_FIELD': True,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['FieldCalculator2'] = processing.run('qgis:fieldcalculator', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(8)
        if feedback.isCanceled():
            return {}

        # Field calculator3
        alg_params = {
            'FIELD_LENGTH': 2,
            'FIELD_NAME': 'NLCD_LU',
            'FIELD_PRECISION': 3,
            'FIELD_TYPE': 1,
            'FORMULA': '\"Value\"',
            'INPUT': outputs['FieldCalculator2']['OUTPUT'],
            'NEW_FIELD': True,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['FieldCalculator3'] = processing.run('qgis:fieldcalculator', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(9)
        if feedback.isCanceled():
            return {}

        # Field calculator4
        alg_params = {
            'FIELD_LENGTH': 3,
            'FIELD_NAME': 'CN',
            'FIELD_PRECISION': 3,
            'FIELD_TYPE': 1,
            'FORMULA': 'replace(\"GDCode\", array(\'11A\', \'11B\', \'11C\', \'11D\', \'11\', \'12A\', \'12B\', \'12C\', \'12D\', \'12\', \'21A\', \'21B\', \'21C\', \'21D\', \'21\', \'22A\', \'22B\', \'22C\', \'22D\', \'22\', \'23A\', \'23B\', \'23C\', \'23D\', \'23\', \'24A\', \'24B\', \'24C\', \'24D\', \'24\', \'31A\', \'31B\', \'31C\', \'31D\', \'31\', \'41A\', \'41B\', \'41C\', \'41D\', \'41\', \'42A\', \'42B\', \'42C\', \'42D\', \'42\', \'43A\', \'43B\', \'43C\', \'43D\', \'43\', \'51A\', \'51B\', \'51C\', \'51D\', \'51\', \'52A\', \'52B\', \'52C\', \'52D\', \'52\', \'71A\', \'71B\', \'71C\', \'71D\', \'71\', \'72A\', \'72B\', \'72C\', \'72D\', \'72\', \'73A\', \'73B\', \'73C\', \'73D\', \'73\', \'74A\', \'74B\', \'74C\', \'74D\', \'74\', \'81A\', \'81B\', \'81C\', \'81D\', \'81\', \'82A\', \'82B\', \'82C\', \'82D\', \'82\', \'90A\', \'90B\', \'90C\', \'90D\', \'90\', \'95A\', \'95B\', \'95C\', \'95D\', \'95\'), array(\'100\', \'100\', \'100\', \'100\', \'100\', \'100\', \'100\', \'100\', \'100\', \'100\', \'52\', \'68\', \'78\', \'84\', \'84\', \'100\', \'88\', \'90\', \'93\', \'93\', \'84\', \'89\', \'93\', \'94\', \'94\', \'88\', \'92\', \'93\', \'94\', \'94\', \'70\', \'81\', \'88\', \'92\', \'92\', \'30\', \'30\', \'41\', \'48\', \'48\', \'30\', \'55\', \'70\', \'77\', \'77\', \'36\', \'60\', \'73\', \'79\', \'79\', \'33\', \'42\', \'55\', \'62\', \'62\', \'33\', \'42\', \'55\', \'62\', \'62\', \'47\', \'63\', \'75\', \'85\', \'85\', \'47\', \'63\', \'75\', \'85\', \'85\', \'74\', \'74\', \'74\', \'74\', \'74\', \'79\', \'79\', \'79\', \'79\', \'79\', \'40\', \'61\', \'73\', \'79\', \'79\', \'62\', \'74\', \'82\', \'86\', \'86\', \'86\', \'86\', \'86\', \'86\', \'86\', \'80\', \'80\', \'80\', \'80\', \'80\'))',
            'INPUT': outputs['FieldCalculator3']['OUTPUT'],
            'NEW_FIELD': True,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }
        outputs['FieldCalculator4'] = processing.run('qgis:fieldcalculator', alg_params, context=context, feedback=feedback, is_child_algorithm=True)

        feedback.setCurrentStep(10)
        if feedback.isCanceled():
            return {}

        # Drop field(s)
        alg_params = {
            'COLUMN': 'VALUE;GDCodeTemp',
            'INPUT': outputs['FieldCalculator4']['OUTPUT'],
            'OUTPUT': parameters['Cn_grid']
        }
        outputs['DropFields'] = processing.run('qgis:deletecolumn', alg_params, context=context, feedback=feedback, is_child_algorithm=True)
        results['Cn_grid'] = outputs['DropFields']['OUTPUT']
        return results

    def name(self):
        return 'CN_Grid'

    def displayName(self):
        return 'CN_Grid'

    def group(self):
        return 'QGIS Tools'

    def groupId(self):
        return 'QGIS Tools'

    def shortHelpString(self):
        return """<html><body><h2>Algorithm description</h2></body></html>"""

    def createInstance(self):
        return Cn_grid()