Respect ignore-center-block in the no-place-event block helpers

Addresses the Copilot review on #280: checkBlockLimit and addBlockCount
(used for the copper golem's chest, which appears without a place event)
bypassed the ignore-center-block exclusion that process() applies, so a
build at the island center could be limited or counted when a normal
placement there would not be.

The comparison also has to be by block coordinates: these helpers receive
entity spawn locations with fractional coordinates and yaw/pitch, which
never equal the block-aligned center Location. A shared predicate now
covers both helpers and processKey.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015dbJyrv2uxHfTmiWkqGUJB

Author: tastybento

src/main/java/world/bentobox/limits/listeners/BlockLimitsListener.java

@@ -472,6 +472,22 @@ && isSamePlant(b.getRelative(BlockFace.DOWN).getType(), fixMaterial(blockData)))
      *
      * @return limit amount if at/over the limit (nothing was counted), or -1 on success
      */
+    /**
+     * True when the config ignores the island's center block and {@code loc} is that
+     * block. Compares block coordinates so entity locations (fractional coordinates,
+     * yaw/pitch) are matched correctly.
+     */
+    private boolean isIgnoredCenterBlock(Island island, Location loc) {
+        if (!addon.getConfig().getBoolean("ignore-center-block", true)) {
+            return false;
+        }
+        Location center = island.getCenter();
+        return center != null && Objects.equals(center.getWorld(), loc.getWorld())
+                && center.getBlockX() == loc.getBlockX()
+                && center.getBlockY() == loc.getBlockY()
+                && center.getBlockZ() == loc.getBlockZ();
+    }
+
     public int processKey(World world, Location location, NamespacedKey key, boolean add) {
         if (!addon.inGameModeWorld(world)) {
             return -1;
@@ -483,8 +499,7 @@ public int processKey(World world, Location location, NamespacedKey key, boolean
             if (gameMode.isEmpty()) {
                 return -1;
             }
-            if (addon.getConfig().getBoolean("ignore-center-block", true)
-                    && i.getCenter().equals(location)) {
+            if (isIgnoredCenterBlock(i, location)) {
                 return -1;
             }
             islandCountMap.putIfAbsent(id, new IslandBlockCount(id, gameMode));
@@ -551,7 +566,7 @@ public int checkBlockLimit(Location loc, NamespacedKey key) {
         return addon.getIslands().getIslandAt(loc).map(i -> {
             String id = i.getUniqueId();
             String gameMode = addon.getGameModeName(w);
-            if (gameMode.isEmpty()) {
+            if (gameMode.isEmpty() || isIgnoredCenterBlock(i, loc)) {
                 return -1;
             }
             islandCountMap.putIfAbsent(id, new IslandBlockCount(id, gameMode));
@@ -573,7 +588,7 @@ public void addBlockCount(Location loc, NamespacedKey key) {
         addon.getIslands().getIslandAt(loc).ifPresent(i -> {
             String id = i.getUniqueId();
             String gameMode = addon.getGameModeName(w);
-            if (gameMode.isEmpty()) {
+            if (gameMode.isEmpty() || isIgnoredCenterBlock(i, loc)) {
                 return;
             }
             Environment env = envOf(w);

src/test/java/world/bentobox/limits/listeners/BlockLimitsListenerTest.java

@@ -1097,6 +1097,35 @@ void testIndividualLimitStillAppliesInsideGroup() {
         assertTrue(event.isCancelled());
     }
 
+    // --- Center-block exclusion for the no-place-event helpers (#276 review) ---
+
+    @Test
+    void testCheckBlockLimitIgnoresCenterBlock() {
+        // At the limit everywhere else, but the location is the island center block
+        IslandBlockCount ibc = new IslandBlockCount("test-island-id", "BSkyBlock");
+        ibc.setBlockLimit(Environment.NORMAL, Material.CHEST.getKey(), 0);
+        listener.setIsland("test-island-id", ibc);
+
+        // Entity-style location inside the center block (fractional coordinates)
+        Location entityLoc = new Location(world, 0.5, 65.0, 0.3);
+        assertEquals(-1, listener.checkBlockLimit(entityLoc, Material.CHEST.getKey()));
+        // Away from the center the limit applies
+        assertEquals(0, listener.checkBlockLimit(blockLocation, Material.CHEST.getKey()));
+    }
+
+    @Test
+    void testAddBlockCountIgnoresCenterBlock() {
+        IslandBlockCount ibc = new IslandBlockCount("test-island-id", "BSkyBlock");
+        listener.setIsland("test-island-id", ibc);
+
+        Location entityLoc = new Location(world, 0.5, 65.0, 0.3);
+        listener.addBlockCount(entityLoc, Material.CHEST.getKey());
+        assertEquals(0, listener.getIsland("test-island-id").getBlockCount(Material.CHEST.getKey()));
+
+        listener.addBlockCount(blockLocation, Material.CHEST.getKey());
+        assertEquals(1, listener.getIsland("test-island-id").getBlockCount(Material.CHEST.getKey()));
+    }
+
     // --- Custom block keys (#176) ---
 
     @Test