fix: allow pistons on merged plot road if detect-invalid-edge-pistons true

- fixes #4232

.github/workflows/build-pr.yml

@@ -7,16 +7,15 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
-        jdk: [ 17, 21 ]
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
       - name: Validate Gradle Wrapper
         uses: gradle/wrapper-validation-action@v1
-      - name: Setup Java ${{ matrix.jdk }}
+      - name: Setup Java
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: ${{ matrix.jdk }}
+          java-version: 17
       - name: Clean Build
         run: ./gradlew clean build

Bukkit/src/main/java/com/plotsquared/bukkit/listener/BlockEventListener.java

@@ -261,7 +261,10 @@ public class BlockEventListener implements Listener {
                 final BlockFace facing = piston.getFacing();
                 location = location.add(facing.getModX(), facing.getModY(), facing.getModZ());
                 Plot newPlot = area.getOwnedPlotAbs(location);
-                if (!plot.equals(newPlot)) {
+                if (plot.equals(newPlot)) {
+                    return;
+                }
+                if (!plot.isMerged() || !plot.getConnectedPlots().contains(newPlot)) {
                     event.setCancelled(true);
                     plot.debug("Prevented piston update because of invalid edge piston detection");
                 }