diff --git a/.github/workflows/ci-rust-python-package.yaml b/.github/workflows/ci-rust-python-package.yaml
index a4f9090..7d57720 100644
--- a/.github/workflows/ci-rust-python-package.yaml
+++ b/.github/workflows/ci-rust-python-package.yaml
@@ -232,8 +232,7 @@ jobs:
       - name: Create mutation diff
         env:
           BASE_SHA: ${{ github.event.pull_request.base.sha }}
-          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
-        run: git diff "${BASE_SHA}..${HEAD_SHA}" -- '*.rs' > cargo-mutants.diff
+        run: git diff "${BASE_SHA}" -- '*.rs' > cargo-mutants.diff
 
       - name: Run cargo-mutants with nextest
         env:
diff --git a/plugins/rust/python-package/secrets_detection/src/object_model.rs b/plugins/rust/python-package/secrets_detection/src/object_model.rs
index ac336d8..2d3b2a3 100644
--- a/plugins/rust/python-package/secrets_detection/src/object_model.rs
+++ b/plugins/rust/python-package/secrets_detection/src/object_model.rs
@@ -14,7 +14,7 @@ pub fn inspect_object_state<'py>(
     py: Python<'py>,
     container: &Bound<'py, PyAny>,
 ) -> PyResult<InspectedObjectState<'py>> {
-    inspect_object_state_inner(py, container, true)
+    inspect_object_state_inner(py, container, include_model_dump_by_default())
 }
 
 pub(crate) fn inspect_object_state_without_model_dump<'py>(
@@ -24,6 +24,10 @@ pub(crate) fn inspect_object_state_without_model_dump<'py>(
     inspect_object_state_inner(py, container, false)
 }
 
+fn include_model_dump_by_default() -> bool {
+    true
+}
+
 fn inspect_object_state_inner<'py>(
     py: Python<'py>,
     container: &Bound<'py, PyAny>,
diff --git a/tests/test_plugin_catalog.py b/tests/test_plugin_catalog.py
index 8070af5..9b1a56d 100644
--- a/tests/test_plugin_catalog.py
+++ b/tests/test_plugin_catalog.py
@@ -2652,9 +2652,9 @@ def test_ci_workflow_includes_parity_jobs_for_rust_plugin_checks(self) -> None:
         self.assertIn("cargo install cargo-mutants --version 27.0.0 --locked", mutants_install_run)
         self.assertIn("cargo mutants --version", mutants_install_run)
         self.assertIn("fetch-depth: 0", mutants_section)
-        self.assertEqual('git diff "${BASE_SHA}..${HEAD_SHA}" -- \'*.rs\' > cargo-mutants.diff\n', mutants_diff_run)
+        self.assertEqual('git diff "${BASE_SHA}" -- \'*.rs\' > cargo-mutants.diff\n', mutants_diff_run)
         self.assertIn("BASE_SHA: ${{ github.event.pull_request.base.sha }}", mutants_section)
-        self.assertIn("HEAD_SHA: ${{ github.event.pull_request.head.sha }}", mutants_section)
+        self.assertNotIn("HEAD_SHA:", mutants_section)
         self.assertIn("mutation_job: ${{ fromJson(needs.validate-and-detect.outputs.mutation_jobs) }}", mutants_section)
         self.assertIn("CARGO_PACKAGE: ${{ matrix.mutation_job.cargo_package }}", mutants_section)
         self.assertIn("IN_DIFF: ${{ matrix.mutation_job.in_diff }}", mutants_section)