diff --git a/e2e/features/image/test_image.py b/e2e/features/image/test_image.py
index a7e990505..581acf43f 100644
--- a/e2e/features/image/test_image.py
+++ b/e2e/features/image/test_image.py
@@ -9,7 +9,7 @@
     (siibra.features.get(siibra.get_template("big brain"), "CellBodyStainedVolumeOfInterest"), 2),
     (siibra.features.get(siibra.get_template("mni152"), "image", restrict_space=True), 4),
     (siibra.features.get(siibra.get_template("mni152"), "image", restrict_space=False), 13),
-    (siibra.features.get(siibra.get_region('julich 3', 'hoc1 left'), "CellbodyStainedSection"), 47),
+    (siibra.features.get(siibra.get_region('julich 3.0.3', 'hoc1 left'), "CellbodyStainedSection"), 47),
     (siibra.features.get(siibra.get_region('julich 2.9', 'hoc1 left'), "CellbodyStainedSection"), 41)
 ]
 features = [f for fts, _ in results for f in fts]
diff --git a/siibra/core/region.py b/siibra/core/region.py
index 905887da6..756fc9704 100644
--- a/siibra/core/region.py
+++ b/siibra/core/region.py
@@ -642,17 +642,28 @@ def assign(self, other: structure.BrainStructure) -> AnatomicalAssignment:
                 self._ASSIGNMENT_CACHE[self, other] = regionmap.assign(other)
                 return self._ASSIGNMENT_CACHE[self, other]
 
+            try:
+                regionbbox_otherspace = self.get_boundingbox(other.space, restrict_space=False)
+                if regionbbox_otherspace is not None:
+                    self._ASSIGNMENT_CACHE[self, other] = regionbbox_otherspace.assign(other)
+                    return self._ASSIGNMENT_CACHE[self, other]
+            except Exception as e:
+                logger.debug(e)
+
             assignment_result = None
-            for space in self.supported_spaces:
+            for targetspace in self.supported_spaces:
                 try:
-                    other_warped = other.warp(space)
-                    regionmap = self.get_regional_map(space)
+                    other_warped = other.warp(targetspace)
+                    regionmap = self.get_regional_map(targetspace)
                     assignment_result = regionmap.assign(other_warped)
                 except SpaceWarpingFailedError:
                     try:
-                        regionbbox_warped = self.get_boundingbox(
-                            space, restrict_space=True
-                        ).warp(other.space)
+                        regionbbox_targetspace = self.get_boundingbox(
+                            targetspace, restrict_space=True
+                        )
+                        if regionbbox_targetspace is None:
+                            continue
+                        regionbbox_warped = regionbbox_targetspace.warp(other.space)
                     except SpaceWarpingFailedError:
                         continue
                     assignment_result = regionbbox_warped.assign(other)
@@ -694,7 +705,7 @@ def get_boundingbox(
         space: _space.Space,
         maptype: MapType = MapType.LABELLED,
         threshold_statistical=None,
-        restrict_space=False,
+        restrict_space=True,
         **fetch_kwargs
     ):
         """Compute the bounding box of this region in the given space.
@@ -740,7 +751,7 @@ def get_boundingbox(
                             bbox_warped = bbox.warp(spaceobj)
                         except SpaceWarpingFailedError:
                             continue
-                        logger.warning(
+                        logger.debug(
                             f"No bounding box for {self.name} defined in {spaceobj.name}, "
                             f"warped the bounding box from {other_space.name} instead."
                         )