diff --git a/pyproject.toml b/pyproject.toml
index 4621a6ac8..d8997316b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "truss"
-version = "0.10.9rc1"
+version = "0.10.9rc520"
 description = "A seamless bridge from model development to model delivery"
 authors = [
     { name = "Pankaj Gupta", email = "no-reply@baseten.co" },
diff --git a/truss/contexts/image_builder/serving_image_builder.py b/truss/contexts/image_builder/serving_image_builder.py
index 3835a4d48..515278800 100644
--- a/truss/contexts/image_builder/serving_image_builder.py
+++ b/truss/contexts/image_builder/serving_image_builder.py
@@ -809,9 +809,8 @@ def _render_dockerfile(
             data_dir_exists=data_dir.exists(),
             model_dir_exists=model_dir.exists(),
             bundled_packages_dir_exists=bundled_packages_dir.exists(),
-            truss_hash=directory_content_hash(
-                self._truss_dir, self._spec.hash_ignore_patterns
-            ),
+            # Create a sanitized copy of the truss directory for hash calculation
+            truss_hash=self._calculate_sanitized_truss_hash(build_dir),
             models=model_files,
             use_hf_secret=use_hf_secret,
             cached_files=cached_files,
@@ -832,3 +831,26 @@ def _render_dockerfile(
         ).strip()
         docker_file_path = build_dir / MODEL_DOCKERFILE_NAME
         docker_file_path.write_text(dockerfile_contents)
+
+    def _calculate_sanitized_truss_hash(self, build_dir: Path) -> str:
+        """Calculate hash from a sanitized copy of the truss directory with runtime fields cleared."""
+        sanitized_truss_dir = build_dir / "build_model_scaffold"
+
+        # Remove existing copy if it exists
+        if sanitized_truss_dir.exists():
+            shutil.rmtree(sanitized_truss_dir)
+
+        # Copy the entire truss directory
+        shutil.copytree(self._truss_dir, sanitized_truss_dir)
+
+        # Clear runtime fields from the config
+        config_file_path = sanitized_truss_dir / "config.yaml"
+        if config_file_path.exists():
+            truss_config = TrussConfig.from_yaml(config_file_path)
+            truss_config.clear_runtime_fields()
+            truss_config.write_to_yaml_file(config_file_path)
+
+        # Calculate hash from the sanitized directory
+        return directory_content_hash(
+            sanitized_truss_dir, self._spec.hash_ignore_patterns
+        )
diff --git a/truss/truss_handle/patch/hash.py b/truss/truss_handle/patch/hash.py
index 7fe35e87e..201c282d8 100644
--- a/truss/truss_handle/patch/hash.py
+++ b/truss/truss_handle/patch/hash.py
@@ -1,3 +1,4 @@
+import traceback
 from pathlib import Path
 from typing import Any, List, Optional
 
@@ -19,6 +20,15 @@ def directory_content_hash(
     underneath. The (root) Directory will have the same hash, even if renamed.
     """
     hasher = blake3()
+    print(f"Calculating hash for {root}, ignore_patterns: {ignore_patterns}")
+
+    # Print caller chain
+    caller_chain = traceback.extract_stack()
+    if len(caller_chain) > 1:
+        print("Caller chain:")
+        for i, frame in enumerate(caller_chain[:-1]):  # Skip the current function
+            print(f"  {i + 1}. {frame.filename}:{frame.lineno} in {frame.name}")
+
     paths = list(get_unignored_relative_paths_from_root(root, ignore_patterns))
     paths.sort()
     for path in paths:
@@ -26,7 +36,9 @@ def directory_content_hash(
         absolute_path = root / path
         if absolute_path.is_file():
             hasher.update(file_content_hash(absolute_path))
-    return hasher.hexdigest()
+    hash_str = hasher.hexdigest()
+    print(f"Hash for {root}: {hash_str}")
+    return hash_str
 
 
 def file_content_hash(file: Path) -> bytes:
diff --git a/truss/truss_handle/truss_handle.py b/truss/truss_handle/truss_handle.py
index c0710df61..89671396e 100644
--- a/truss/truss_handle/truss_handle.py
+++ b/truss/truss_handle/truss_handle.py
@@ -938,6 +938,9 @@ def _build_image(
 
     def _update_config(self, **fields_to_update):
         config = self._spec.config.model_copy(update=fields_to_update)
+        print(
+            f"Updating config: {fields_to_update}, writing to {self._spec.config_path}"
+        )
         config.write_to_yaml_file(self._spec.config_path)
         self._spec = TrussSpec(self._truss_dir)  # Reload.
 
diff --git a/uv.lock b/uv.lock
index d98a74fbb..dba98f535 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3312,7 +3312,7 @@ wheels = [
 
 [[package]]
 name = "truss"
-version = "0.10.9rc1"
+version = "0.10.9rc520"
 source = { editable = "." }
 dependencies = [
     { name = "aiofiles" },