How can you create an item when a player upgrades something?

[Aesirkin]

I'm writing a farming mod in which players can take action to upgrade plant blocks.  For those unfamiliar with farming, I imagine this should be very similar to using a hammer to upgrade a frame shape, and the same solution should apply.

I have a watering can item that players can use to water their plants.  This consumes a murky water:

<item name="AesF_wateringCan">
<property name="CustomIcon" value="bucketRiverWater" />
<property name="CustomIconTint" value="99CCFF" />
<property name="DescriptionKey" value="AesF_wateringCanDesc" />
<property name="Tags" value="tool,wateringCan" />
<property name="Group" value="Tools/Traps" />
<property name="HoldType" value="34" />
<property name="Meshfile" value="#Other/Items?Crafting/Metal/IronBucketWaterPrefab.prefab" />
<property name="DropMeshfile" value="Items/Misc/sack_droppedPrefab" />
<property name="Material" value="Mmetal" />
<property name="RepairTools" value="resourceScrapIron" />
<property name="DegradationBreaksAfter" value="false" />
<property name="SoundJammed" value="ItemNeedsRepair" />
<property name="ShowQuality" value="false" />
<property name="RepairExpMultiplier" value="5.5" />
<property name="SellableToTrader" value="false" />
<property class="Action0">
<property name="Class" value="Repair" />
<property name="Delay" value="1.0" />
<property name="Repair_amount" value="100" />
<property name="Upgrade_hit_offset" value="-1" />
<property name="Upgrade_action_sound" value="bucketbail_water" />
<property name="Allowed_upgrade_items" value="AesF_wateringCan,drinkJarRiverWater" />
<property name="UsePowerAttackAnimation" value="false" />
</property>
<property class="Action1">
<property name="Class" value="Repair" />
<property name="Delay" value="1.0" />
<property name="Repair_amount" value="100" />
<property name="Upgrade_hit_offset" value="0" />
<property name="Upgrade_action_sound" value="bucketbail_water" />
<property name="Allowed_upgrade_items" value="AesF_wateringCan,drinkJarRiverWater" />
<property name="UsePowerAttackAnimation" value="false" />
</property>
</item>




(Still a WIP)

I would like this to create an empty water jar in the player's inventory.  First I tried adding a create item line within the actions, which I copied from the existing items.xml file:

<property class="Action0">
<property name="Class" value="Repair" />
<property name="Delay" value="1.0" />
<property name="Repair_amount" value="100" />
<property name="Upgrade_hit_offset" value="-1" />
<property name="Upgrade_action_sound" value="bucketbail_water" />
<property name="Allowed_upgrade_items" value="AesF_wateringCan,drinkJarRiverWater" />
<property name="UsePowerAttackAnimation" value="false" />
<property name="Create_item" value="drinkJarEmpty"/>
<property name="Create_item_count" value="1"/>
</property>




However, nothing happens when I use this item to upgrade.  I copied it from I believe the boiled water item, which does give back an empty jar when used.

So then I went to the plant block itself, and tried adding it to the upgrade property:

<property class="UpgradeBlock">
<property name="ToBlock" value="AesF_FarmingYuccaGrowing" />
<property name="Item" value="drinkJarRiverWater" />
<property name="ItemCount" value="1" />
<property name="UpgradeHitCount" value="1" />
<property name="Create_item" value="drinkJarEmpty"/>
</property>




Again, nothing happens.  No errors in either case; I just didn't get an empty jar.  I suspect because that create_item command is meant to occur during a "use" or "eat" event, and not an "upgrade" event.

I also took a shot in the dark hoping there was such a thing as an "upgrade" event:

<drop event="Upgrade" name="drinkJarEmpty" count="1" />




But 7DTD yelled at me that this was an invalid event type (I got an error in the console).

How do I get this jar into the player's inventory when they consume the murky water to upgrade a block?