diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
index fd38b7748..2818a8434 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
@@ -184,7 +184,7 @@ public class BukkitWorld extends AbstractWorld {
         BukkitImplAdapter adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();
         try {
             if (adapter != null) {
-                return adapter.regenerate(getWorld(), region, null, null, editSession);
+                return adapter.regenerate(getWorld(), region, editSession);
             } else {
                 throw new UnsupportedOperationException("Missing BukkitImplAdapater for this version.");
             }
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java
index 7eb54e8f9..591626f0f 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java
@@ -240,11 +240,7 @@ public interface BukkitImplAdapter<T> extends IBukkitAdapter {
      * @return true on success, false on failure
      */
     default boolean regenerate(org.bukkit.World world, Region region, EditSession session) {
-        return regenerate(world, region, null, null, session);
-    }
-
-    default boolean regenerate(org.bukkit.World world, Region region, @Nullable Long seed, @Nullable BiomeType biome, EditSession editSession) {
-        return editSession.regenerate(region);
+        return session.regenerate(region);
     }
 
     default IChunkGet get(World world, int chunkX, int chunkZ) {
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_14_R4.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_14_R4.java
index a3dc483f3..b5094f0db 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_14_R4.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_14_R4.java
@@ -54,6 +54,7 @@ import com.sk89q.worldedit.world.registry.BlockMaterial;
 import net.minecraft.server.v1_14_R1.*;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
+import org.bukkit.World.Environment;
 import org.bukkit.block.data.BlockData;
 import org.bukkit.craftbukkit.v1_14_R1.CraftChunk;
 import org.bukkit.craftbukkit.v1_14_R1.CraftWorld;
@@ -361,7 +362,7 @@ public final class FAWE_Spigot_v1_14_R4 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public boolean regenerate(org.bukkit.World world, Region region, @Nullable Long seed, @Nullable BiomeType biome, EditSession editSession) {
+    public boolean regenerate(org.bukkit.World world, Region region, EditSession editSession) {
         WorldServer originalWorld = ((CraftWorld) world).getHandle();
         ChunkProviderServer provider = originalWorld.getChunkProvider();
         if (!(provider instanceof ChunkProviderServer)) {
@@ -379,26 +380,16 @@ public final class FAWE_Spigot_v1_14_R4 extends CachedBukkitAdapter implements I
             WorldData newWorldData = new WorldData(originalWorld.worldData.a((NBTTagCompound) null),
                     server.dataConverterManager, getDataVersion(), null);
 
-            ChunkGenerator generator = world.getGenerator();
-            org.bukkit.World.Environment environment = world.getEnvironment();
-            if (seed != null) {
-                if (biome == BiomeTypes.NETHER) {
-                    environment = org.bukkit.World.Environment.NETHER;
-                } else if (biome == BiomeTypes.THE_END) {
-                    environment = org.bukkit.World.Environment.THE_END;
-                } else {
-                    environment = org.bukkit.World.Environment.NORMAL;
-                }
-                generator = null;
-            }
+            ChunkGenerator gen = world.getGenerator();
+            Environment env = world.getEnvironment();
             try (WorldServer freshWorld = new WorldServer(server,
                     server.executorService, saveHandler,
                     newWorldData,
                     originalWorld.worldProvider.getDimensionManager(),
                     originalWorld.getMethodProfiler(),
                     server.worldLoadListenerFactory.create(11),
-                    environment,
-                    generator){
+                    env,
+                    gen){
                 @Override
                 public boolean addEntityChunk(net.minecraft.server.v1_14_R1.Entity entity) {
                     //Fixes #320; Prevent adding entities so we aren't attempting to spawn them asynchronously
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R1.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R1.java
index ce6091bb9..49dfea72f 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R1.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R1.java
@@ -56,6 +56,7 @@ import com.sk89q.worldedit.world.registry.BlockMaterial;
 import net.minecraft.server.v1_15_R1.*;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
+import org.bukkit.World.Environment;
 import org.bukkit.block.data.BlockData;
 import org.bukkit.craftbukkit.v1_15_R1.CraftChunk;
 import org.bukkit.craftbukkit.v1_15_R1.CraftWorld;
@@ -368,7 +369,7 @@ public final class FAWE_Spigot_v1_15_R1 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public boolean regenerate(org.bukkit.World world, Region region, @Nullable Long seed, @Nullable BiomeType biome, EditSession editSession) {
+    public boolean regenerate(org.bukkit.World world, Region region, EditSession editSession) {
         WorldServer originalWorld = ((CraftWorld) world).getHandle();
         ChunkProviderServer provider = originalWorld.getChunkProvider();
         if (!(provider instanceof ChunkProviderServer)) {
@@ -387,26 +388,16 @@ public final class FAWE_Spigot_v1_15_R1 extends CachedBukkitAdapter implements I
                     server.dataConverterManager, getDataVersion(), null);
             newWorldData.setName(UUID.randomUUID().toString());
 
-            ChunkGenerator generator = world.getGenerator();
-            org.bukkit.World.Environment environment = world.getEnvironment();
-            if (seed != null) {
-                if (biome == BiomeTypes.NETHER) {
-                    environment = org.bukkit.World.Environment.NETHER;
-                } else if (biome == BiomeTypes.THE_END) {
-                    environment = org.bukkit.World.Environment.THE_END;
-                } else {
-                    environment = org.bukkit.World.Environment.NORMAL;
-                }
-                generator = null;
-            }
+            ChunkGenerator gen = world.getGenerator();
+            Environment env = world.getEnvironment();
             try (WorldServer freshWorld = new WorldServer(server,
                     server.executorService, saveHandler,
                     newWorldData,
                     originalWorld.worldProvider.getDimensionManager(),
                     originalWorld.getMethodProfiler(),
                     server.worldLoadListenerFactory.create(11),
-                    environment,
-                    generator){
+                    env,
+                    gen){
                 @Override
                 public boolean addEntityChunk(net.minecraft.server.v1_15_R1.Entity entity) {
                     //Fixes #320; Prevent adding entities so we aren't attempting to spawn them asynchronously
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
index e384bd4e4..3ee354bd6 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
@@ -56,6 +56,7 @@ import com.sk89q.worldedit.world.registry.BlockMaterial;
 import net.minecraft.server.v1_15_R1.*;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
+import org.bukkit.World.Environment;
 import org.bukkit.block.data.BlockData;
 import org.bukkit.craftbukkit.v1_15_R1.CraftChunk;
 import org.bukkit.craftbukkit.v1_15_R1.CraftWorld;
@@ -370,7 +371,7 @@ public final class FAWE_Spigot_v1_15_R2 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public boolean regenerate(org.bukkit.World world, Region region, @Nullable Long seed, @Nullable BiomeType biome, EditSession editSession) {
+    public boolean regenerate(org.bukkit.World world, Region region, EditSession editSession) {
         WorldServer originalWorld = ((CraftWorld) world).getHandle();
         ChunkProviderServer provider = originalWorld.getChunkProvider();
         if (!(provider instanceof ChunkProviderServer)) {
@@ -389,26 +390,16 @@ public final class FAWE_Spigot_v1_15_R2 extends CachedBukkitAdapter implements I
                     server.dataConverterManager, getDataVersion(), null);
             newWorldData.setName(UUID.randomUUID().toString());
 
-            ChunkGenerator generator = world.getGenerator();
-            org.bukkit.World.Environment environment = world.getEnvironment();
-            if (seed != null) {
-                if (biome == BiomeTypes.NETHER) {
-                    environment = org.bukkit.World.Environment.NETHER;
-                } else if (biome == BiomeTypes.THE_END) {
-                    environment = org.bukkit.World.Environment.THE_END;
-                } else {
-                    environment = org.bukkit.World.Environment.NORMAL;
-                }
-                generator = null;
-            }
+            ChunkGenerator gen = world.getGenerator();
+            Environment env = world.getEnvironment();
             try (WorldServer freshWorld = new WorldServer(server,
                     server.executorService, saveHandler,
                     newWorldData,
                     originalWorld.worldProvider.getDimensionManager(),
                     originalWorld.getMethodProfiler(),
                     server.worldLoadListenerFactory.create(11),
-                    environment,
-                    generator){
+                    env,
+                    gen){
                 @Override
                 public boolean addEntityChunk(net.minecraft.server.v1_15_R1.Entity entity) {
                     //Fixes #320; Prevent adding entities so we aren't attempting to spawn them asynchronously