chore: add annotations to suppress IDE warnings

Bukkit/src/main/java/com/plotsquared/bukkit/util/fawe/FaweRegionManager.java

@@ -37,7 +37,9 @@ import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.world.biome.BiomeType;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
+import org.jetbrains.annotations.NotNull;
 
+import java.util.Objects;
 import java.util.Set;
 
 public class FaweRegionManager extends BukkitRegionManager {
@@ -59,7 +61,10 @@ public class FaweRegionManager extends BukkitRegionManager {
             @Nullable PlotPlayer<?> actor,
             @Nullable QueueCoordinator queue
     ) {
-        return delegate.setCuboids(area, regions, blocks, minY, maxY, queue.getCompleteTask());
+        return delegate.setCuboids(
+                area, regions, blocks, minY, maxY,
+                Objects.requireNonNullElseGet(queue, area::getQueue).getCompleteTask()
+        );
     }
 
     @Override
@@ -111,7 +116,7 @@ public class FaweRegionManager extends BukkitRegionManager {
     }
 
     @Override
-    public boolean regenerateRegion(final Location pos1, final Location pos2, boolean ignore, final Runnable whenDone) {
+    public boolean regenerateRegion(final @NotNull Location pos1, final @NotNull Location pos2, boolean ignore, final Runnable whenDone) {
         return delegate.regenerateRegion(pos1, pos2, ignore, whenDone);
     }