Program: 134225
Project: 134225
Buggy source:
@Override public void execute(MinecraftServer server,ICommandSender commandSender,String[] args) throws CommandException {
  if (StructureRegistry.INSTANCE.ids().isEmpty()) {
    commandSender.addChatMessage(new TextComponentString("String_Node_Str"));
    return;
  }
  boolean sane=true;
  sane&=addStructureLog(commandSender,(s,structure) -> !structure.generationTypes(GenerationType.class).isEmpty(),"String_Node_Str");
  sane&=addGenerationLog(commandSender,NaturalGeneration.class,(structure,gen) -> Biome.REGISTRY.getKeys().stream().anyMatch(b -> StructureSelector.generationWeightInBiome(gen.biomeWeights,Biome.REGISTRY.getObject(b)) > 0),"String_Node_Str");
  sane&=addGenerationLog(commandSender,NaturalGeneration.class,(structure,gen) -> Stream.of(DimensionManager.getIDs()).anyMatch(d -> StructureSelector.generationWeightInDimension(gen.dimensionWeights,server.worldServerForDimension(d).provider) > 0),"String_Node_Str");
  sane&=addGenerationLog(commandSender,NaturalGeneration.class,(structure,gen) -> gen.getActiveGenerationWeight() > 0,"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaGeneration.class,(structure,gen) -> Biome.REGISTRY.getKeys().stream().anyMatch(b -> gen.biomeMatcher.test(Biome.REGISTRY.getObject(b))),"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaGeneration.class,(structure,gen) -> gen.getActiveWeight() > 0,"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaDecorationGeneration.class,(structure,gen) -> Biome.REGISTRY.getKeys().stream().anyMatch(b -> StructureSelector.generationWeightInBiome(gen.biomeWeights,Biome.REGISTRY.getObject(b)) > 0),"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaDecorationGeneration.class,(structure,gen) -> Stream.of(DimensionManager.getIDs()).anyMatch(d -> StructureSelector.generationWeightInDimension(gen.dimensionWeights,server.worldServerForDimension(d).provider) > 0),"String_Node_Str");
  if (sane)   commandSender.addChatMessage(new TextComponentString("String_Node_Str"));
}

Fixed version (ground truth):
@Override public void execute(MinecraftServer server,ICommandSender commandSender,String[] args) throws CommandException {
  if (StructureRegistry.INSTANCE.ids().isEmpty()) {
    commandSender.sendMessage(new TextComponentString("String_Node_Str"));
    return;
  }
  boolean sane=true;
  sane&=addStructureLog(commandSender,(s,structure) -> !structure.generationTypes(GenerationType.class).isEmpty(),"String_Node_Str");
  sane&=addGenerationLog(commandSender,NaturalGeneration.class,(structure,gen) -> Biome.REGISTRY.getKeys().stream().anyMatch(b -> StructureSelector.generationWeightInBiome(gen.biomeWeights,Biome.REGISTRY.getObject(b)) > 0),"String_Node_Str");
  sane&=addGenerationLog(commandSender,NaturalGeneration.class,(structure,gen) -> Stream.of(DimensionManager.getIDs()).anyMatch(d -> StructureSelector.generationWeightInDimension(gen.dimensionWeights,server.worldServerForDimension(d).provider) > 0),"String_Node_Str");
  sane&=addGenerationLog(commandSender,NaturalGeneration.class,(structure,gen) -> gen.getActiveGenerationWeight() > 0,"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaGeneration.class,(structure,gen) -> Biome.REGISTRY.getKeys().stream().anyMatch(b -> gen.biomeMatcher.test(Biome.REGISTRY.getObject(b))),"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaGeneration.class,(structure,gen) -> gen.getActiveWeight() > 0,"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaDecorationGeneration.class,(structure,gen) -> Biome.REGISTRY.getKeys().stream().anyMatch(b -> StructureSelector.generationWeightInBiome(gen.biomeWeights,Biome.REGISTRY.getObject(b)) > 0),"String_Node_Str");
  sane&=addGenerationLog(commandSender,VanillaDecorationGeneration.class,(structure,gen) -> Stream.of(DimensionManager.getIDs()).anyMatch(d -> StructureSelector.generationWeightInDimension(gen.dimensionWeights,server.worldServerForDimension(d).provider) > 0),"String_Node_Str");
  if (sane)   commandSender.sendMessage(new TextComponentString("String_Node_Str"));
}