Closes Anuken/Mindustry-Suggestions/issues/4780 (dumping neoplasm from tanks)

core/src/mindustry/entities/comp/BuildingComp.java

@@ -1344,6 +1344,15 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
         return block.itemCapacity;
     }
 
+    /** Called when a block begins (not finishes!) deconstruction. The building is still present at this point. */
+    public void onDeconstructed(@Nullable Unit builder){
+        //deposit non-incinerable liquid on ground
+        if(liquids != null && liquids.currentAmount() > 0 && (!liquids.current().incinerable || block.deconstructDropAllLiquid)){
+            float perCell = liquids.currentAmount() / (block.size * block.size) * 2f;
+            tile.getLinkedTiles(other -> Puddles.deposit(other, liquids.current(), perCell));
+        }
+    }
+
     /** Called when the block is destroyed. The tile is still intact at this stage. */
     public void onDestroyed(){
         float explosiveness = block.baseExplosiveness;