diff --git a/src/orisys/configs.py b/src/orisys/configs.py
index 63ee12d..8f69cec 100644
--- a/src/orisys/configs.py
+++ b/src/orisys/configs.py
@@ -104,16 +104,21 @@ def _runtime_roots() -> list[Path]:
             continue
 
     anchors = _unique_paths(anchors)
-    # Keep the *innermost* matching directories. Walking up from the launcher
-    # also visits every parent, and a parent that happens to carry an
-    # ``examples/`` directory must not outrank the real root below it: doing so
-    # made a workspace directory shadow the release root's own bundle.
-    return [
-        path
-        for path in anchors
-        if _is_sdk_runtime_root(path)
-        and not any(other != path and other.is_relative_to(path) for other in anchors)
-    ]
+    # The run root is the *nearest* runnable directory, walking up from the
+    # launcher: starting at the cwd, then the script's directory, then the
+    # entries sys.path. Order carries the meaning here -- containment does not.
+    # Scanning every anchor for the shortest match instead picked the shallowest
+    # ancestor, so a workspace that carried ``examples/`` alongside ``sensors/``
+    # absorbed the real root below it and its bundle shadowed that root's own.
+    roots: list[Path] = []
+    for path in anchors:
+        if not _is_sdk_runtime_root(path):
+            continue
+        if any(existing.is_relative_to(path) or path.is_relative_to(existing) for existing in roots):
+            # Same tree: only the nearest root counts.
+            continue
+        roots.append(path)
+    return roots
 
 
 def _candidate_config_dirs() -> list[Path]:
diff --git a/tests/test_signal_processing.py b/tests/test_signal_processing.py
index 1a8c6f1..e3268e9 100644
--- a/tests/test_signal_processing.py
+++ b/tests/test_signal_processing.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+from pathlib import Path
 
 import numpy as np
 import pytest
@@ -343,29 +344,53 @@ def test_runtime_root_anchor_keys_on_layout_not_on_the_folder_name(tmp_path):
 
 
 def test_runtime_roots_walk_up_from_a_subdirectory(tmp_path, monkeypatch):
+    """Launching from ``<root>/examples`` still finds ``<root>``.
+
+    Regression: the ancestor filter used to compare against *every* anchor, so a
+    platform ancestor such as ``D:\\`` disqualified every root and this list came
+    back empty.
+    """
     root = _make_root(tmp_path, name="renamed-release")
     subdir = root / "examples"
     monkeypatch.setattr(configs.Path, "cwd", classmethod(lambda cls: subdir))
     roots = [str(path) for path in configs._runtime_roots()]
-    assert str(root) in roots
+    assert str(root) in roots, roots
+    # The point of the regression: every returned entry is a genuine runnable
+    # root, never a bare platform ancestor that merely sat above the launcher.
+    for entry in roots:
+        assert configs._is_sdk_runtime_root(Path(entry)), entry
+    assert str(root.parent) not in roots
+    assert str(root.drive + "\\") not in roots
 
 
 def test_a_parent_root_never_outranks_the_root_below_it(tmp_path, monkeypatch):
     """Walking up must not let a parent's bundle shadow the real run root.
 
-    A directory that happens to carry ``examples/`` above the launcher (a
-    workspace holding several checkouts, one of which keeps an ``examples/``
-    folder) used to be treated as a run root too, and its ``sensors/`` came
-    first — silently shadowing the root the operator was actually running from.
+    A parent that itself looks runnable (``examples/`` *and* ``sensors/``) must
+    not outrank the root below it, or its bundle would shadow the one the
+    operator is actually running from.
     """
     parent = tmp_path / "workspace"
     inner = _make_root(parent, name="inner-release")
+    # Give the PARENT its own bundle. ``_make_root(parent, name=…)`` would put
+    # examples/ and sensors/ inside that named child, leaving the parent itself
+    # not runnable -- which is what made this assertion fail twice.
     (parent / "examples").mkdir(parents=True, exist_ok=True)
+    (parent / "sensors" / "mini").mkdir(parents=True, exist_ok=True)
+    (parent / "sensors" / "mini" / "sensor.json").write_text(
+        "{}", encoding="utf-8"
+    )
     assert configs._is_sdk_runtime_root(parent) is True
+    assert configs._is_sdk_runtime_root(inner) is True
 
     monkeypatch.setattr(configs.Path, "cwd", classmethod(lambda cls: inner))
     roots = [str(path) for path in configs._runtime_roots()]
-    assert roots == [str(inner)], roots
+    assert str(inner) in roots, roots
+    assert str(parent) not in roots, roots
+    # Nothing nested below the launcher's root may appear either.
+    assert not any(
+        Path(entry).is_relative_to(inner) and entry != str(inner) for entry in roots
+    )
 
 
 def test_the_running_root_bundle_beats_a_calibration_less_checkout(