diff --git a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/cause/Cause.java b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/cause/Cause.java
index 643dc3e4b..1b8109036 100644
--- a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/cause/Cause.java
+++ b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/cause/Cause.java
@@ -27,6 +27,7 @@
 import com.sk89q.worldguard.bukkit.util.Entities;
 import io.papermc.lib.PaperLib;
 import org.bukkit.Bukkit;
+import org.bukkit.Material;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.block.Block;
 import org.bukkit.entity.AnimalTamer;
@@ -187,6 +188,22 @@ public Block getFirstBlock() {
         return null;
     }
 
+    /**
+     * Get the first causing block's current material when its region is owned
+     * by the current thread. A cause may refer to a block in another region
+     * or world, for example the origin of a falling block.
+     *
+     * @return the material, or null if the block cannot be read here
+     */
+    @Nullable
+    public Material getFirstBlockType() {
+        Block block = getFirstBlock();
+        if (block == null || (WorldGuardPlugin.inst().isFolia() && !Bukkit.isOwnedByCurrentRegion(block.getLocation()))) {
+            return null;
+        }
+        return block.getType();
+    }
+
     /**
      * Find the first type matching one in the given array.
      *
diff --git a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java
index 0b274f505..267e7ea37 100644
--- a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java
+++ b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java
@@ -246,7 +246,7 @@ public void onBlockPlace(BlockPlaceEvent event) {
         BlockState previousState = event.getBlockReplacedState();
 
         // Some blocks, like tall grass and fire, get replaced
-        if (previousState.getType() != Material.AIR && previousState.getType() != event.getBlockReplacedState().getType()) {
+        if (previousState.getType() != Material.AIR && previousState.getType() != event.getBlockPlaced().getType()) {
             Events.fireToCancel(event, new BreakBlockEvent(event, create(event.getPlayer()), previousState.getLocation(), previousState.getType()));
         }
 
diff --git a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionFlagsListener.java b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionFlagsListener.java
index 957579cea..decc316c7 100644
--- a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionFlagsListener.java
+++ b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionFlagsListener.java
@@ -33,8 +33,8 @@
 import com.sk89q.worldguard.protection.flags.StateFlag;
 import com.sk89q.worldguard.protection.regions.RegionQuery;
 import org.bukkit.Location;
+import org.bukkit.Material;
 import org.bukkit.World;
-import org.bukkit.block.Block;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
@@ -62,11 +62,9 @@ public void onPlaceBlock(final PlaceBlockEvent event) {
 
         RegionQuery query = WorldGuard.getInstance().getPlatform().getRegionContainer().createQuery();
 
-        Block block;
-        if ((block = event.getCause().getFirstBlock()) != null) {
-            if (Materials.isPistonBlock(block.getType())) {
-                event.filter(testState(query, Flags.PISTONS), false);
-            }
+        Material causeType = event.getCause().getFirstBlockType();
+        if (causeType != null && Materials.isPistonBlock(causeType)) {
+            event.filter(testState(query, Flags.PISTONS), false);
         }
 
         if (event.getCause().find(EntityType.SNOW_GOLEM) != null) {
@@ -85,11 +83,9 @@ public void onBreakBlock(final BreakBlockEvent event) {
         WorldConfiguration config = getWorldConfig(event.getWorld());
         RegionQuery query = WorldGuard.getInstance().getPlatform().getRegionContainer().createQuery();
 
-        Block block;
-        if ((block = event.getCause().getFirstBlock()) != null) {
-            if (Materials.isPistonBlock(block.getType())) {
-                event.filter(testState(query, Flags.PISTONS), false);
-            }
+        Material causeType = event.getCause().getFirstBlockType();
+        if (causeType != null && Materials.isPistonBlock(causeType)) {
+            event.filter(testState(query, Flags.PISTONS), false);
         }
 
         if (event.getCause().find(EntityType.CREEPER) != null) { // Creeper
diff --git a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionProtectionListener.java b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionProtectionListener.java
index 5351d08f0..f69908469 100644
--- a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionProtectionListener.java
+++ b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/RegionProtectionListener.java
@@ -177,9 +177,9 @@ public void onPlaceBlock(final PlaceBlockEvent event) {
 
             /* Flint and steel, fire charge, etc. */
             if (Materials.isFire(type)) {
-                Block block = event.getCause().getFirstBlock();
-                boolean fire = block != null && Materials.isFire(block.getType());
-                boolean lava = block != null && Materials.isLava(block.getType());
+                Material causeType = event.getCause().getFirstBlockType();
+                boolean fire = causeType != null && Materials.isFire(causeType);
+                boolean lava = causeType != null && Materials.isLava(causeType);
                 List<StateFlag> flags = new ArrayList<>();
                 flags.add(Flags.BLOCK_PLACE);
                 flags.add(Flags.LIGHTER);