I am trying to create Terraforming improvements that would create food.

Strangely, both solutions below (one with stat, one with a trigger) don't work. Any idea ?

Note: The one with stat display the food correctly but does nothing.

The one with trigger show the food as a cost but does nothing.

  <Improvement>
    <InternalName>PlanetaryUpgrade</InternalName>
    <DisplayName>PlanetaryUpgrade_Name</DisplayName>
    <ShortDescription>PlanetaryUpgrade_ShortDec</ShortDescription>
    <Description>PlanetaryUpgrade_Dec</Description>
    <Icon>SoilEnhancement.png</Icon>
    <BuildIcon>SoilEnhancement_Build.png</BuildIcon>
    <ListIcon>SoilEnhancement_Icon.png</ListIcon>
    <ImprovementType>Terraforming</ImprovementType>
    <PlacementType>Terraforming</PlacementType>
    <IsColonyUnique>true</IsColonyUnique>
    <LandPercentageMin>0.35</LandPercentageMin>
    <Stats>
      <EffectType>ManufacturingCost</EffectType>
      <Scope>Queue</Scope>
      <Target>
        <TargetType>Improvement</TargetType>
      </Target>
      <BonusType>Flat</BonusType>
      <Value>60</Value>
    </Stats>
    <Stats>
      <EffectType>FoodIncome</EffectType>
      <Target>
        <TargetType>Colony</TargetType>
      </Target>
      <BonusType>Flat</BonusType>
      <Value>1</Value>
    </Stats>   
    <Triggers>
      <OnEvent>OnConstructImprovment</OnEvent>
      <Target>
        <TargetType>Colony</TargetType>
      </Target>
      <Lifetime>Instant</Lifetime>
      <Modifier>
        <EffectType>FoodIncome</EffectType>
        <Target>
          <TargetType>Colony</TargetType>
        </Target>
        <BonusType>Flat</BonusType>
        <Value>2</Value>
      </Modifier>
    </Triggers>   
    <Prerequ>
      <Techs>
        <Option>TechTree</Option>
        <Option>EnvironmentalEngineering</Option>
        <Option>TorianPlanetaryImprovement</Option>
      </Techs>
    </Prerequ>
  </Improvement>