Spigot does not support parallel stream processing for placing blocks and entities in the world.

This is a hot-fix release.

Author: BONNe

pom.xml

@@ -82,7 +82,7 @@
         <!-- Do not change unless you want different name for local builds. -->
         <build.number>-LOCAL</build.number>
         <!-- This allows to change between versions. -->
-        <build.version>1.21.0</build.version>
+        <build.version>1.21.1</build.version>
         <sonar.organization>bentobox-world</sonar.organization>
         <sonar.host.url>https://sonarcloud.io</sonar.host.url>
     </properties>

src/main/java/world/bentobox/bentobox/nms/fallback/PasteHandlerImpl.java

@@ -16,7 +16,7 @@
 public class PasteHandlerImpl implements PasteHandler {
     @Override
     public CompletableFuture<Void> pasteBlocks(Island island, World world, Map<Location, BlueprintBlock> blockMap) {
-        return blockMap.entrySet().parallelStream()
+        return blockMap.entrySet().stream()
                 .map(entry -> DefaultPasteUtil.setBlock(island, entry.getKey(), entry.getValue()))
                 .collect(
                         Collectors.collectingAndThen(
@@ -28,7 +28,7 @@ public CompletableFuture<Void> pasteBlocks(Island island, World world, Map<Locat
 
     @Override
     public CompletableFuture<Void> pasteEntities(Island island, World world, Map<Location, List<BlueprintEntity>> entityMap) {
-        return entityMap.entrySet().parallelStream()
+        return entityMap.entrySet().stream()
                 .map(entry -> DefaultPasteUtil.setEntity(island, entry.getKey(), entry.getValue()))
                 .collect(
                         Collectors.collectingAndThen(