diff --git a/python/sglang/multimodal_gen/configs/sample/sampling_params.py b/python/sglang/multimodal_gen/configs/sample/sampling_params.py
index 61e08ac6a..b05fb62e9 100644
--- a/python/sglang/multimodal_gen/configs/sample/sampling_params.py
+++ b/python/sglang/multimodal_gen/configs/sample/sampling_params.py
@@ -138,7 +138,7 @@ class SamplingParams:
     return_trajectory_latents: bool = False  # returns all latents for each timestep
     return_trajectory_decoded: bool = False  # returns decoded latents for each timestep
     # if True, allow user params to override subclass-defined protected fields
-    override_protected_fields: bool = False
+    no_override_protected_fields: bool = True
     # whether to adjust num_frames for multi-GPU friendly splitting (default: True)
     adjust_frames: bool = True
 
@@ -290,15 +290,6 @@ class SamplingParams:
         self._set_output_file_name()
         self.log(server_args=server_args)
 
-    def update(self, source_dict: dict[str, Any]) -> None:
-        for key, value in source_dict.items():
-            if hasattr(self, key):
-                setattr(self, key, value)
-            else:
-                logger.exception("%s has no attribute %s", type(self).__name__, key)
-
-        self.__post_init__()
-
     @classmethod
     def from_pretrained(cls, model_path: str, **kwargs) -> "SamplingParams":
         from sglang.multimodal_gen.registry import get_model_info
@@ -522,12 +513,11 @@ class SamplingParams:
             help="Whether to return the decoded trajectory",
         )
         parser.add_argument(
-            "--override-protected-fields",
+            "--no-override-protected-fields",
             action="store_true",
-            default=SamplingParams.override_protected_fields,
+            default=SamplingParams.no_override_protected_fields,
             help=(
-                "If set, allow user params to override fields defined in subclasses "
-                "(protected by default)."
+                "If set, disallow user params to override fields defined in subclasses."
             ),
         )
         parser.add_argument(
@@ -583,32 +573,21 @@ class SamplingParams:
         subclass_defined_fields = set(type(self).__annotations__.keys())
 
         # global switch: if True, allow overriding protected fields
-        allow_override_protected = bool(
-            user_params.override_protected_fields or self.override_protected_fields
-        )
-
-        # Compare against current instance to avoid constructing a default instance
-        default_params = SamplingParams()
+        allow_override_protected = not user_params.no_override_protected_fields
 
         for field in dataclasses.fields(user_params):
             field_name = field.name
             user_value = getattr(user_params, field_name)
-            default_value = getattr(default_params, field_name)
+            default_value = getattr(self, field_name)
 
             # A field is considered user-modified if its value is different from
-            # the default, with an exception for `output_file_name` which is
-            # auto-generated with a random component.
-            is_user_modified = (
-                user_value != default_value
-                if field_name != "output_file_name"
-                else user_params.output_file_path is not None
-            )
+            # the default
+            is_user_modified = user_value != default_value
             if is_user_modified and (
                 allow_override_protected or field_name not in subclass_defined_fields
             ):
                 if hasattr(self, field_name):
                     setattr(self, field_name, user_value)
-
         self.height_not_provided = user_params.height_not_provided
         self.width_not_provided = user_params.width_not_provided
         self.__post_init__()
diff --git a/python/sglang/multimodal_gen/runtime/entrypoints/cli/generate.py b/python/sglang/multimodal_gen/runtime/entrypoints/cli/generate.py
index 9b4f8b591..2256eaebc 100644
--- a/python/sglang/multimodal_gen/runtime/entrypoints/cli/generate.py
+++ b/python/sglang/multimodal_gen/runtime/entrypoints/cli/generate.py
@@ -10,10 +10,7 @@ from typing import cast
 
 import sglang.multimodal_gen.envs as envs
 from sglang.multimodal_gen import DiffGenerator
-from sglang.multimodal_gen.configs.sample.sampling_params import (
-    SamplingParams,
-    generate_request_id,
-)
+from sglang.multimodal_gen.configs.sample.sampling_params import SamplingParams
 from sglang.multimodal_gen.runtime.entrypoints.cli.cli_types import CLISubcommand
 from sglang.multimodal_gen.runtime.entrypoints.cli.utils import (
     RaiseNotImplementedAction,
@@ -89,8 +86,7 @@ def maybe_dump_performance(args: argparse.Namespace, server_args, prompt: str, r
 
 def generate_cmd(args: argparse.Namespace):
     """The entry point for the generate command."""
-    # FIXME(mick): do not hard code
-    args.request_id = generate_request_id()
+    args.request_id = "mocked_fake_id_for_offline_generate"
 
     # Auto-enable stage logging if dump path is provided
     if args.perf_dump_path:
diff --git a/python/sglang/multimodal_gen/runtime/pipelines_core/stages/denoising.py b/python/sglang/multimodal_gen/runtime/pipelines_core/stages/denoising.py
index ed2f7aab8..8bbdb3d89 100644
--- a/python/sglang/multimodal_gen/runtime/pipelines_core/stages/denoising.py
+++ b/python/sglang/multimodal_gen/runtime/pipelines_core/stages/denoising.py
@@ -297,6 +297,30 @@ class DenoisingStage(PipelineStage):
 
         return reserved_frames_mask_sp, z_sp
 
+    def _handle_boundary_ratio(
+        self,
+        server_args,
+        batch,
+    ):
+        """
+        (Wan2.2) Calculate timestep to switch from high noise expert to low noise expert
+        """
+        boundary_ratio = server_args.pipeline_config.dit_config.boundary_ratio
+        if batch.boundary_ratio is not None:
+            logger.info(
+                "Overriding boundary ratio from %s to %s",
+                boundary_ratio,
+                batch.boundary_ratio,
+            )
+            boundary_ratio = batch.boundary_ratio
+
+        if boundary_ratio is not None:
+            boundary_timestep = boundary_ratio * self.scheduler.num_train_timesteps
+        else:
+            boundary_timestep = None
+
+        return boundary_timestep
+
     def _prepare_denoising_loop(self, batch: Req, server_args: ServerArgs):
         """
         Prepare all necessary invariant variables for the denoising loop.
@@ -362,20 +386,7 @@ class DenoisingStage(PipelineStage):
             assert neg_prompt_embeds is not None
             # Removed Tensor truthiness assert to avoid GPU sync
 
-        # (Wan2.2) Calculate timestep to switch from high noise expert to low noise expert
-        boundary_ratio = server_args.pipeline_config.dit_config.boundary_ratio
-        if batch.boundary_ratio is not None:
-            logger.info(
-                "Overriding boundary ratio from %s to %s",
-                boundary_ratio,
-                batch.boundary_ratio,
-            )
-            boundary_ratio = batch.boundary_ratio
-
-        if boundary_ratio is not None:
-            boundary_timestep = boundary_ratio * self.scheduler.num_train_timesteps
-        else:
-            boundary_timestep = None
+        boundary_timestep = self._handle_boundary_ratio(server_args, batch)
 
         # specifically for Wan2_2_TI2V_5B_Config, not applicable for FastWan2_2_TI2V_5B_Config
         should_preprocess_for_wan_ti2v = (
diff --git a/python/sglang/multimodal_gen/test/server/testcase_configs.py b/python/sglang/multimodal_gen/test/server/testcase_configs.py
index 75022e0b8..3e8ed441a 100644
--- a/python/sglang/multimodal_gen/test/server/testcase_configs.py
+++ b/python/sglang/multimodal_gen/test/server/testcase_configs.py
@@ -269,18 +269,19 @@ ONE_GPU_CASES_A: list[DiffusionTestCase] = [
         ),
     ),
     # === Text and Image to Image (TI2I) ===
-    # TODO: Timeout with Torch2.9. Add back when it can pass CI
-    # DiffusionTestCase(
-    #     id="qwen_image_edit_ti2i",
-    #     model_path="Qwen/Qwen-Image-Edit",
-    #     modality="image",
-    #     prompt=None,  # not used for editing
-    #     output_size="1024x1536",
-    #     warmup_text=0,
-    #     warmup_edit=1,
-    #     edit_prompt="Convert 2D style to 3D style",
-    #     image_path="https://github.com/lm-sys/lm-sys.github.io/releases/download/test/TI2I_Qwen_Image_Edit_Input.jpg",
-    # ),
+    DiffusionTestCase(
+        "qwen_image_edit_ti2i",
+        DiffusionServerArgs(
+            model_path="Qwen/Qwen-Image-Edit",
+            modality="image",
+            warmup_text=0,
+            warmup_edit=1,
+        ),
+        DiffusionSamplingParams(
+            prompt="Convert 2D style to 3D style",
+            image_path="https://github.com/lm-sys/lm-sys.github.io/releases/download/test/TI2I_Qwen_Image_Edit_Input.jpg",
+        ),
+    ),
 ]
 
 ONE_GPU_CASES_B: list[DiffusionTestCase] = [
diff --git a/python/sglang/multimodal_gen/test/slack_utils.py b/python/sglang/multimodal_gen/test/slack_utils.py
index 7237c891a..706197be3 100644
--- a/python/sglang/multimodal_gen/test/slack_utils.py
+++ b/python/sglang/multimodal_gen/test/slack_utils.py
@@ -49,7 +49,7 @@ except Exception as e:
 
 def _get_status_message(run_id, current_case_id, thread_messages=None):
     date_str = datetime.now().strftime("%d/%m")
-    base_header = f""""*🧵 for nightly test of {date_str}*
+    base_header = f"""🧵 for nightly test of {date_str}*
 *Git Revision:* {get_git_commit_hash()}
 *GitHub Run ID:* {run_id}
 *Total Tasks:* {len(ALL_CASES)}