diff --git a/src/bonsai/bonsai/bim/module/drawing/data.py b/src/bonsai/bonsai/bim/module/drawing/data.py
index cd24989981..af8fac3cdf 100644
--- a/src/bonsai/bonsai/bim/module/drawing/data.py
+++ b/src/bonsai/bonsai/bim/module/drawing/data.py
@@ -235,8 +235,8 @@ class DecoratorData:
     cut_cache = {}
     slice_cache = {}
     fill_cache = {}
-    camera_location_checksum = None
-    camera_rotation_checksum = None
+    camera_location_checksum = ""
+    camera_rotation_checksum = ""
 
     @classmethod
     def clear_cache(cls):
diff --git a/src/bonsai/bonsai/bim/module/drawing/decoration.py b/src/bonsai/bonsai/bim/module/drawing/decoration.py
index 2e5a75c9be..f6db70462f 100644
--- a/src/bonsai/bonsai/bim/module/drawing/decoration.py
+++ b/src/bonsai/bonsai/bim/module/drawing/decoration.py
@@ -1731,20 +1731,23 @@ class CutDecorator:
 
     def cache_camera_matrix(self):
         obj = bpy.context.scene.camera
-        DecoratorData.camera_location_checksum = repr(np.array(obj.matrix_world.translation).tobytes())
-        DecoratorData.camera_rotation_checksum = repr(np.array(obj.matrix_world.to_3x3()).tobytes())
+        # Explicit `dtype` for Blender <5.0 compatibility.
+        DecoratorData.camera_location_checksum = repr(
+            np.array(obj.matrix_world.translation, dtype=np.float32).tobytes()
+        )
+        DecoratorData.camera_rotation_checksum = repr(np.array(obj.matrix_world.to_3x3(), dtype=np.float32).tobytes())
 
     def is_camera_moved(self):
         if not DecoratorData.camera_location_checksum:
             self.cache_camera_matrix()
             return True  # Let's be conservative
         obj = bpy.context.scene.camera
-        loc_check = np.frombuffer(eval(DecoratorData.camera_location_checksum))
+        loc_check = np.frombuffer(eval(DecoratorData.camera_location_checksum), dtype=np.float32)
         loc_real = np.array(obj.matrix_world.translation).flatten()
         if not np.allclose(loc_check, loc_real, atol=1e-4):  # 0.1 mm
             self.cache_camera_matrix()
             return True
-        rot_check = np.frombuffer(eval(DecoratorData.camera_rotation_checksum)).reshape(3, 3)
+        rot_check = np.frombuffer(eval(DecoratorData.camera_rotation_checksum), dtype=np.float32).reshape(3, 3)
         rot_real = np.array(obj.matrix_world.to_3x3())
         rot_dot = np.dot(rot_check, rot_real.T)
         angle_rad = np.arccos(np.clip((np.trace(rot_dot) - 1) / 2, -1, 1))
diff --git a/src/bonsai/bonsai/tool/geometry.py b/src/bonsai/bonsai/tool/geometry.py
index 6df540ef13..b7aa4ff15b 100644
--- a/src/bonsai/bonsai/tool/geometry.py
+++ b/src/bonsai/bonsai/tool/geometry.py
@@ -1146,8 +1146,9 @@ class Geometry(bonsai.core.tool.Geometry):
     def record_object_position(cls, obj: bpy.types.Object) -> None:
         # These are recorded separately because they have different numerical tolerances
         props = tool.Blender.get_object_bim_props(obj)
-        props.location_checksum = repr(np.array(obj.matrix_world.translation).tobytes())
-        props.rotation_checksum = repr(np.array(obj.matrix_world.to_3x3()).tobytes())
+        # Explicit dtype for Blender <5.0 compatibility.
+        props.location_checksum = repr(np.array(obj.matrix_world.translation, dtype=np.float32).tobytes())
+        props.rotation_checksum = repr(np.array(obj.matrix_world.to_3x3(), dtype=np.float32).tobytes())
 
     @classmethod
     def remove_connection(cls, connection: ifcopenshell.entity_instance) -> None:
diff --git a/src/bonsai/bonsai/tool/ifc.py b/src/bonsai/bonsai/tool/ifc.py
index a85a8bd3e8..dfb2370272 100644
--- a/src/bonsai/bonsai/tool/ifc.py
+++ b/src/bonsai/bonsai/tool/ifc.py
@@ -110,11 +110,11 @@ class Ifc(bonsai.core.tool.Ifc):
         oprops = tool.Blender.get_object_bim_props(obj)
         if not oprops.location_checksum:
             return True  # Let's be conservative
-        loc_check = np.frombuffer(eval(oprops.location_checksum))
+        loc_check = np.frombuffer(eval(oprops.location_checksum), dtype=np.float32)
         loc_real = np.array(obj.matrix_world.translation).flatten()
         if not np.allclose(loc_check, loc_real, atol=1e-4):  # 0.1 mm
             return True
-        rot_check = np.frombuffer(eval(oprops.rotation_checksum)).reshape(3, 3)
+        rot_check = np.frombuffer(eval(oprops.rotation_checksum), dtype=np.float32).reshape(3, 3)
         rot_real = np.array(obj.matrix_world.to_3x3())
         rot_dot = np.dot(rot_check, rot_real.T)
         angle_rad = np.arccos(np.clip((np.trace(rot_dot) - 1) / 2, -1, 1))
diff --git a/src/bonsai/test/tool/test_geometry.py b/src/bonsai/test/tool/test_geometry.py
index 93198a2f51..af7670275d 100644
--- a/src/bonsai/test/tool/test_geometry.py
+++ b/src/bonsai/test/tool/test_geometry.py
@@ -321,8 +321,8 @@ class TestRecordObjectPosition(NewFile):
         obj = bpy.data.objects.new("Object", None)
         props = tool.Blender.get_object_bim_props(obj)
         subject.record_object_position(obj)
-        assert props.location_checksum == repr(np.array(obj.matrix_world.translation).tobytes())
-        assert props.rotation_checksum == repr(np.array(obj.matrix_world.to_3x3()).tobytes())
+        assert props.location_checksum == repr(np.array(obj.matrix_world.translation, dtype=np.float32).tobytes())
+        assert props.rotation_checksum == repr(np.array(obj.matrix_world.to_3x3(), dtype=np.float32).tobytes())
 
 
 class TestRemoveConnection(NewFile):