Fix fuse_qkv only applying to BFL-format LoKR

fuse_qkv=True with LyCORIS or diffusers-native checkpoints would fuse
the model QKV then fail injection (adapter targets separate Q/K/V modules
that no longer exist). Now only set fuse_qkv metadata for BFL format.

Author: CalamitousFelicitousness

benchmark_lokr.py

@@ -162,8 +162,9 @@ def main():
         img.save(path)
         print(f"  Saved: {path}")
 
-    # Tier 1: Fuse-first (lossless, BFL only)
+    # Tier 1: Fuse-first (lossless, BFL format only - identical to tier 2 for other formats)
     if 1 in args.tiers:
+        print("\n  Note: Tier 1 only differs from tier 2 for BFL-format LoKR (fused QKV).")
         img = benchmark_tier1_fuse_first(pipe, args.prompt, args.seed, args.lokr_path, args.lokr_name)
         path = os.path.join(OUTPUT_DIR, "tier1_fuse_lossless.png")
         img.save(path)

src/diffusers/loaders/lora_pipeline.py

@@ -5691,7 +5691,8 @@ def lora_state_dict(
 
         is_lokr = any("lokr_" in k for k in state_dict)
         if is_lokr:
-            if any(k.startswith("diffusion_model.") for k in state_dict):
+            is_bfl_format = any(k.startswith("diffusion_model.") for k in state_dict)
+            if is_bfl_format:
                 state_dict = _convert_non_diffusers_flux2_lokr_to_diffusers(state_dict, fuse_qkv=fuse_qkv)
             elif any(k.startswith("lycoris_") for k in state_dict):
                 state_dict = _convert_lycoris_flux2_lokr_to_diffusers(state_dict)
@@ -5700,7 +5701,8 @@ def lora_state_dict(
             if metadata is None:
                 metadata = {}
             metadata["is_lokr"] = "true"
-            if fuse_qkv:
+            # Only fuse model QKV for BFL format (which has fused QKV keys to map 1:1)
+            if fuse_qkv and is_bfl_format:
                 metadata["fuse_qkv"] = "true"
         else:
             is_ai_toolkit = any(k.startswith("diffusion_model.") for k in state_dict)