diff --git a/mempalace/project_scanner.py b/mempalace/project_scanner.py
index e67220b..f426e8f 100644
--- a/mempalace/project_scanner.py
+++ b/mempalace/project_scanner.py
@@ -296,10 +296,7 @@ def _looks_like_real_name(name: str) -> bool:
 def _walk(root: Path, max_depth: int = MAX_DEPTH):
     for dirpath, dirs, files in os.walk(root):
         dirs[:] = [d for d in dirs if d not in SKIP_DIRS and not d.startswith(".")]
-        try:
-            rel = Path(dirpath).relative_to(root)
-        except ValueError:
-            continue
+        rel = Path(dirpath).relative_to(root)
         depth = 0 if rel == Path(".") else len(rel.parts)
         if depth > max_depth:
             dirs.clear()
diff --git a/tests/test_project_scanner.py b/tests/test_project_scanner.py
index 0483959..821f527 100644
--- a/tests/test_project_scanner.py
+++ b/tests/test_project_scanner.py
@@ -221,17 +221,25 @@ def _require_git() -> None:
         pytest.skip("git executable not available")
 
 
-def _git_commit(
-    path: Path, filename: str, content: str, message: str, name: str, email: str
-) -> None:
-    _require_git()
+def _git_test_env(name: str, email: str) -> dict[str, str]:
     env = {
-        **os.environ,
         "GIT_AUTHOR_NAME": name,
         "GIT_AUTHOR_EMAIL": email,
         "GIT_COMMITTER_NAME": name,
         "GIT_COMMITTER_EMAIL": email,
     }
+    for key in ("PATH", "HOME", "SystemRoot", "ComSpec", "TMPDIR", "TEMP", "TMP"):
+        value = os.environ.get(key)
+        if value:
+            env[key] = value
+    return env
+
+
+def _git_commit(
+    path: Path, filename: str, content: str, message: str, name: str, email: str
+) -> None:
+    _require_git()
+    env = _git_test_env(name, email)
     (path / filename).write_text(content)
     subprocess.run(["git", "add", filename], cwd=path, check=True, env=env)
     subprocess.run(["git", "commit", "-q", "-m", message], cwd=path, check=True, env=env)