Building dissapears: still has effect

When building this, it vanishes, and is not on the map during construction, but it finishes and upgrades - both buildings don't extend the city or "undergo construction" in the normal way...

    <ImprovementType InternalName="TowerOfConsciousness">
        <DisplayName>Tower of Consciousness</DisplayName>
        <Description>Tower of Consciousness gives all units trained by the faction +1 unit design perk.</Description>
       <AllowedPerFaction>1</AllowedPerFaction>
       <RequiresCity>1</RequiresCity>
        <BarredTerrain>River</BarredTerrain>
        <BarredTerrain>SwampTerrain</BarredTerrain>
        <PreferredTerrain>City</PreferredTerrain>
        <PreferredTerrain>Category:Land</PreferredTerrain>
        <PreferredTerrain>Forest</PreferredTerrain>
        <UpgradesToImprovement>MythicTowerOfConsciousness</UpgradesToImprovement>
        <UpgradeTier>1</UpgradeTier>
        <LaborToBuild>500</LaborToBuild>
           <GameModifier>
                <ModType>Player</ModType>
                <Attribute>AbilityBonus</Attribute>
                <StrVal>A_Traits</StrVal>
                <Value>1</Value>
                <Provides>Increases the available traits for designed units by 1</Provides>
            </GameModifier>
        <AIData AIPersonality="AI_General">
            <AIPriority>5</AIPriority>
            <AITag>CommandPost</AITag>
        </AIData>
        <ArtDef>Art_Sage</ArtDef>
    </ImprovementType>
    <ImprovementType InternalName="MythicTowerOfConsciousness">
        <DisplayName>Mythic Tower of Consciousness</DisplayName>
        <Description>Mythic Tower of Consciousness gives all units trained by the faction +2 design perks.</Description>
       <AllowedPerFaction>1</AllowedPerFaction>
       <RequiresCity>1</RequiresCity>
        <BarredTerrain>River</BarredTerrain>
        <BarredTerrain>SwampTerrain</BarredTerrain>
        <PreferredTerrain>City</PreferredTerrain>
        <PreferredTerrain>Category:Land</PreferredTerrain>
        <PreferredTerrain>Forest</PreferredTerrain>
        <UpgradeTier>2</UpgradeTier>
        <LaborToBuild>1000</LaborToBuild>
           <GameModifier>
                <ModType>Player</ModType>
                <Attribute>AbilityBonus</Attribute>
                <StrVal>A_Traits</StrVal>
                <Value>2</Value>
                <Provides>Increases the available traits for designed units by 2</Provides>
            </GameModifier>
        <AIData AIPersonality="AI_General">
            <AIPriority>5</AIPriority>
            <AITag>CommandPost</AITag>
        </AIData>
        <ArtDef>Art_Sage</ArtDef>
    </ImprovementType>