Added allowRectanglePlacement for 1x1 blocks

core/src/mindustry/world/blocks/ConstructBlock.java

@@ -83,7 +83,7 @@ public class ConstructBlock extends Block{
             tile.setBlock(block, team, rotation);
         }
 
-        if(tile.build != null){
+        if(tile.build != null && tile.build.block == block){
             tile.build.health = block.health * healthf;
 
             if(config != null){
@@ -100,11 +100,11 @@ public class ConstructBlock extends Block{
 
             //make sure block indexer knows it's damaged
             indexer.notifyHealthChanged(tile.build);
-        }
 
-        //last builder was this local client player, call placed()
-        if(tile.build != null && !headless && builder == player.unit()){
-            tile.build.playerPlaced(config);
+            //last builder was this local client player, call placed()
+            if(!headless && builder == player.unit()){
+                tile.build.playerPlaced(config);
+            }
         }
 
         if(fogControl.isVisibleTile(team, tile.x, tile.y)){

core/src/mindustry/world/blocks/environment/Floor.java

@@ -90,6 +90,8 @@ public class Floor extends Block{
         super(name);
         this.variants = variants;
         placeableLiquid = true;
+        allowRectanglePlacement = true;
+        instantBuild = true;
     }
 
     @Override

core/src/mindustry/world/blocks/environment/StaticWall.java

@@ -20,6 +20,8 @@ public class StaticWall extends Prop{
         solid = true;
         variants = 2;
         cacheLayer = CacheLayer.walls;
+        allowRectanglePlacement = true;
+        instantBuild = true;
     }
 
     @Override