Index: ps/trunk/binaries/data/mods/public/simulation/ai/petra/baseManager.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/ai/petra/baseManager.js
+++ ps/trunk/binaries/data/mods/public/simulation/ai/petra/baseManager.js
@@ -233,6 +233,18 @@
 	});
 };
 
+PETRA.BaseManager.prototype.removeFromAssignedDropsite = function(ent)
+{
+	for (const type in this.dropsiteSupplies)
+		for (const proxim in this.dropsiteSupplies[type])
+		{
+			const resourcesList = this.dropsiteSupplies[type][proxim];
+			for (let i = 0; i < resourcesList.length; ++i)
+				if (resourcesList[i].id === ent.id())
+					resourcesList.splice(i--, 1);
+		}
+};
+
 // completely remove the dropsite resources from our list.
 PETRA.BaseManager.prototype.removeDropsite = function(gameState, ent)
 {
Index: ps/trunk/binaries/data/mods/public/simulation/ai/petra/basesManager.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/ai/petra/basesManager.js
+++ ps/trunk/binaries/data/mods/public/simulation/ai/petra/basesManager.js
@@ -132,6 +132,8 @@
 			evt.metadata[PlayerID].base)
 		{
 			const ent = evt.entityObj;
+			if (evt?.metadata?.[PlayerID]?.assignedResource)
+				this.getBaseByID(evt.metadata[PlayerID].base).removeFromAssignedDropsite(ent);
 			if (ent.owner() != PlayerID)
 				continue;
 			// A new base foundation was created and destroyed on the same (AI) turn