Remove unneeded UOE when copying biome sources (#7629)

patches/server/CB-fixes.patch

@@ -10,6 +10,8 @@ Subject: [PATCH] CB fixes
 
 * Fixed method signature of Marker#addPassenger
 
+* Removed unneeded UOE in CustomWorldChunkManager (extends BiomeSource)
+
 diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -60,6 +62,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          this.storageAccess = chunkIoWorker;
          this.registryAccess = registryManager;
          this.structureManager = structureManager;
+diff --git a/src/main/java/org/bukkit/craftbukkit/generator/CustomWorldChunkManager.java b/src/main/java/org/bukkit/craftbukkit/generator/CustomWorldChunkManager.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/generator/CustomWorldChunkManager.java
++++ b/src/main/java/org/bukkit/craftbukkit/generator/CustomWorldChunkManager.java
+@@ -0,0 +0,0 @@ public class CustomWorldChunkManager extends BiomeSource {
+ 
+     @Override
+     public BiomeSource withSeed(long seed) {
+-        // TODO check method further
+-        throw new UnsupportedOperationException("Cannot copy CustomWorldChunkManager");
++        return this; // Paper - Since this doesn't take a seed, no need to throw UOE
+     }
+ 
+     @Override
 diff --git a/src/main/java/org/bukkit/craftbukkit/util/permissions/CraftDefaultPermissions.java b/src/main/java/org/bukkit/craftbukkit/util/permissions/CraftDefaultPermissions.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/craftbukkit/util/permissions/CraftDefaultPermissions.java