diff --git a/looptrace_regionals_vis/__init__.py b/looptrace_regionals_vis/__init__.py
index bd7b7b5..d44ab85 100644
--- a/looptrace_regionals_vis/__init__.py
+++ b/looptrace_regionals_vis/__init__.py
@@ -10,7 +10,7 @@
 
 from numpydoc_decorator import doc  # type: ignore[import-untyped]
 
-__version__ = "0.4.0"
+__version__ = "0.4.1"
 
 _PACKAGE_NAME = package = Path(__file__).parent.name
 
diff --git a/looptrace_regionals_vis/reader.py b/looptrace_regionals_vis/reader.py
index 21fec1e..8a5d9de 100644
--- a/looptrace_regionals_vis/reader.py
+++ b/looptrace_regionals_vis/reader.py
@@ -190,7 +190,7 @@ def build_layers(folder) -> list[FullDataLayer]:  # type: ignore[no-untyped-def]
                         features.update(
                             {
                                 "traceId": [
-                                    r.traceId.get if r.trace_partners else ""  # type: ignore[attr-defined]
+                                    r.traceId.get  # type: ignore[attr-defined]
                                     for r in rois
                                     for _ in r.bounding_box.iter_z_slices_nonnegative()
                                 ]