fixed a bug where the player would immediately pick back up the fixture they've just placed one frame ago

src/net/torvald/terrarum/gameworld/GameWorld.kt

@@ -269,7 +269,7 @@ open class GameWorld() : Disposable {
         layerWall.unsafeSetTile(x, y, tilenum)
         wallDamages.remove(LandUtil.getBlockAddr(this, x, y))
 
-        if (!bypassEvent) {
+        if (!bypassEvent && oldWall != itemID) {
             Terrarum.ingame?.queueWallChangedEvent(oldWall, itemID, x, y)
             Terrarum.ingame?.modified(LandUtil.LAYER_WALL, x, y)
         }
@@ -301,7 +301,7 @@ open class GameWorld() : Disposable {
         }
         // fluid tiles-item should be modified so that they will also place fluid onto their respective map
 
-        if (!bypassEvent) {
+        if (!bypassEvent && oldTerrain != itemID) {
             Terrarum.ingame?.queueTerrainChangedEvent(oldTerrain, itemID, x, y)
             Terrarum.ingame?.modified(LandUtil.LAYER_TERR, x, y)
         }

src/net/torvald/terrarum/gameworld/WorldSimulator.kt

@@ -241,7 +241,7 @@ object WorldSimulator {
                 val currentTile = world.getTileFromTerrain(x, y)
                 val prop = BlockCodex[currentTile]
                 // don't let the falling sand destroy the precious storage chest
-                val isAir = !prop.isSolid && !prop.nameKey.contains("ACTORBLOCK")
+                val isAir = !prop.isSolid && !prop.isActorBlock
                 val support = prop.maxSupport
                 val isFallable = support != -1