Android versionCode not changing

[MatHeartGaming]

Hi everyone! I finally managed to flavorize my app thanks to @AngeloAvv but now I've bumped into another issues which is only Android related. Basically, the app sees all changes I make code side, of course, but it does not see the versionCode. This always remains stuck to version 64 even though I replaces it everywhere in the project.
I changed it in the pubsbec.yaml:

name: ginevra_distribuzioni
description: "The official Ginevra Distribuzioni app"
publish_to: "none"
version: 1.0.0+67

In the flavorizr.yaml:

flavors:
  prod:
    app:
      name: "Ginevra Distribuzioni"

    android:
      applicationId: "it.matbuompy.ginevra_distribuzioni"
      customConfig:
          versionCode: 67
          minSdkVersion: 28
      firebase:
        config: ".firebase/prod/google-services.json"
    ios:
      bundleId: "it.matbuompy.ginevraDistribuzioni"
      firebase:
        config: ".firebase/prod/GoogleService-Info.plist"
    macos:
      bundleId: "it.matbuompy.ginevraDistribuzioni.dev"
      firebase:
        config: ".firebase/prod/GoogleService-Info.plist"
  dev:
    app:
      name: "Ginevra Distribuzioni Dev"
  
    android:
      applicationId: "it.matbuompy.ginevra_distribuzioni.dev"
      firebase:
        config: ".firebase/dev/google-services.json"
    ios:
      bundleId: "it.matbuompy.ginevraDistribuzioni.dev"
      firebase:
        config: ".firebase/dev/GoogleService-Info.plist"
    macos:
      bundleId: "it.matbuompy.ginevraDistribuzioni.dev"
      firebase:
        config: ".firebase/dev/GoogleService-Info.plist"

And my app gradle build file looks like this:

plugins {
    id "com.android.application"
    // START: FlutterFire Configuration
    id 'com.google.gms.google-services'
    id 'com.google.firebase.crashlytics'
    // END: FlutterFire Configuration
    id "kotlin-android"
    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
    id "dev.flutter.flutter-gradle-plugin"
}

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}
def localPropertiesFile = rootProject.file('local.properties')

ext {
    flutterVersionCode = localPropertiesFile.exists() ? new Properties().with { props ->
        localPropertiesFile.withReader('UTF-8') { reader -> props.load(reader) }
        props.getProperty('flutter.versionCode', '1')
    } : '1'

    flutterVersionName = localPropertiesFile.exists() ? new Properties().with { props ->
        localPropertiesFile.withReader('UTF-8') { reader -> props.load(reader) }
        props.getProperty('flutter.versionName', '1.0')
    } : '1.0'

    keystoreProperties = keystorePropertiesFile.exists() ? new Properties().with { props ->
        keystorePropertiesFile.withInputStream { stream -> props.load(stream) }
        props
    } : null
}

android {

    // ----- BEGIN flavorDimensions (autogenerated by flutter_flavorizr) -----
    flavorDimensions += "flavor-type"

    productFlavors {
        prod {
            dimension "flavor-type"
            applicationId "it.matbuompy.ginevra_distribuzioni"
            versionCode 67
            minSdkVersion 28
            versionName "1.0.0"
            resValue "string", "app_name", "Ginevra Distribuzioni"
        }
        dev {
            dimension "flavor-type"
            applicationId "it.matbuompy.ginevra_distribuzioni.dev"
            versionCode 67
            minSdkVersion 28
            versionName "1.0.0"
            resValue "string", "app_name", "Ginevra Distribuzioni Dev"
        }
    }

    // ----- END flavorDimensions (autogenerated by flutter_flavorizr) -----

   namespace = "it.matbuompy.ginevra_distribuzioni"
    compileSdkVersion Math.max(flutter.compileSdkVersion, 34)
    ndkVersion =  "27.0.12077973"

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }

    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_17
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId = "it.matbuompy.ginevra_distribuzioni"
        // You can update the following values to match your application needs.
        // For more information, see: https://flutter.dev/to/review-gradle-config.
        minSdk = 28
        targetSdk = flutter.targetSdkVersion
        versionCode = 67
        versionName = "1.0.0"
    }

    signingConfigs {
        release {
            keyAlias = keystoreProperties['keyAlias']
            keyPassword = keystoreProperties['keyPassword']
            storeFile = keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword = keystoreProperties['storePassword']
        }
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig = signingConfigs.release
            
            minifyEnabled true
            

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

flutter {
    source = "../.."
}

dependencies {
    implementation 'com.google.android.play:integrity:1.4.0' // Add this line
    // Add other dependencies if needed
}

configurations.configureEach {
    exclude group: 'com.google.android.gms', module: 'play-services-safetynet'
}

But when I build the appbundle with the command: flutter build appbundle --flavor prod -t lib/main_prod.dart and then I upload it to Play Console I get this error:

It seems like the versionCode is not being changed. This only affects Android by the way. iOS and web builds increment their build numbers correctly. How can I solve this on Android?