change: allow disabling mushroom mitigation

Author: ishland

c2me-rewrites-chunk-system/src/main/java/com/ishland/c2me/rewrites/chunksystem/common/Config.java

@@ -20,6 +20,16 @@ public class Config {
                      """)
             .getBoolean(false, false);
 
+    public static final boolean suppressGhostMushrooms = new ConfigSystem.ConfigAccessor()
+            .key("chunkSystem.suppressGhostMushrooms")
+            .comment("""
+                    This option workarounds MC-276863, a bug that makes mushrooms appear in non-postprocessed chunks
+                    This bug is amplified with notickvd as it exposes non-postprocessed chunks to players
+                    
+                    This should not affect other worldgen behavior and game mechanics in general
+                    """)
+            .getBoolean(true, false);
+
     public static void init() {
         // intentionally empty
     }

c2me-rewrites-chunk-system/src/main/java/com/ishland/c2me/rewrites/chunksystem/common/statuses/ServerAccessible.java

@@ -63,7 +63,8 @@ public CompletionStage<Void> upgradeToThis(ChunkLoadingContext context) {
         final Chunk chunk = context.holder().getItem().get().chunk();
         Preconditions.checkState(chunk instanceof ProtoChunk, "Chunk must be a proto chunk");
         ProtoChunk protoChunk = (ProtoChunk) chunk;
-        {
+
+        if (Config.suppressGhostMushrooms) {
             ServerWorld serverWorld = ((IThreadedAnvilChunkStorage) context.tacs()).getWorld();
             ChunkRegion chunkRegion = new ChunkRegion(serverWorld, context.chunks(), ChunkGenerationSteps.GENERATION.get(ChunkStatus.FULL), chunk);