diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 1906d2c30..79ae5b896 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -2175,6 +2175,10 @@ void ObjectList::split()
 
     take_snapshot(_(L("Split to Parts")));
 
+    // Before splitting volume we have to remove all custom supports, seams, and multimaterial painting.
+    wxGetApp().plater()->clear_before_change_mesh(obj_idx, _u8L("Custom supports, seams and multimaterial painting were "
+                                                                "removed after splitting the object."));
+
     volume->split(nozzle_dmrs_cnt);
 
     (*m_objects)[obj_idx]->input_file.clear();
@@ -2186,6 +2190,10 @@ void ObjectList::split()
     changed_object(obj_idx);
     // update printable state for new volumes on canvas3D
     wxGetApp().plater()->canvas3D()->update_instance_printable_state_for_object(obj_idx);
+
+    // After removing custom supports, seams, and multimaterial painting, we have to update info about the object to remove information about
+    // custom supports, seams, and multimaterial painting in the right panel.
+    wxGetApp().obj_list()->update_info_items(obj_idx);
 }
 
 void ObjectList::merge(bool to_multipart_object)
@@ -4682,7 +4690,8 @@ void ObjectList::fix_through_netfabb()
             msg += "\n";
         }
 
-        plater->clear_before_change_mesh(obj_idx);
+        plater->clear_before_change_mesh(obj_idx, _u8L("Custom supports, seams and multimaterial painting were "
+                                                       "removed after repairing the mesh."));
         std::string res;
         if (!fix_model_by_win10_sdk_gui(*(object(obj_idx)), vol_idx, progress_dlg, msg, res))
             return false;
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp
index 177d9d5a7..90552c0a5 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp
@@ -540,7 +540,11 @@ void GLGizmoSimplify::apply_simplify() {
     const Selection& selection = m_parent.get_selection();
     auto plater = wxGetApp().plater();
     plater->take_snapshot(_u8L("Simplify ") + create_volumes_name(m_volume_ids, selection));
-    plater->clear_before_change_mesh(selection.get_object_idx());
+    plater->clear_before_change_mesh(selection.get_object_idx(), _u8L("Custom supports, seams and multimaterial painting were "
+                                                                      "removed after simplifying the mesh."));
+    // After removing custom supports, seams, and multimaterial painting, we have to update info about the object to remove information about
+    // custom supports, seams, and multimaterial painting in the right panel.
+    wxGetApp().obj_list()->update_info_items(selection.get_object_idx());
 
     for (const auto &item: m_state.result) {
         const ObjectID &id = item.first;
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index d4e0b8fbd..15c540082 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3127,6 +3127,10 @@ void Plater::priv::split_object()
     Model new_model = model;
     ModelObject* current_model_object = new_model.objects[obj_idx];
 
+    // Before splitting object we have to remove all custom supports, seams, and multimaterial painting.
+    wxGetApp().plater()->clear_before_change_mesh(obj_idx, _u8L("Custom supports, seams and multimaterial painting were "
+                                                                "removed after splitting the object."));
+
     wxBusyCursor wait;
     ModelObjectPtrs new_objects;
     current_model_object->split(&new_objects);
@@ -7338,7 +7342,7 @@ bool Plater::set_printer_technology(PrinterTechnology printer_technology)
     return ret;
 }
 
-void Plater::clear_before_change_mesh(int obj_idx)
+void Plater::clear_before_change_mesh(int obj_idx, const std::string &notification_msg)
 {
     ModelObject* mo = model().objects[obj_idx];
 
@@ -7356,8 +7360,7 @@ void Plater::clear_before_change_mesh(int obj_idx)
         get_notification_manager()->push_notification(
                     NotificationType::CustomSupportsAndSeamRemovedAfterRepair,
                     NotificationManager::NotificationLevel::PrintInfoNotificationLevel,
-                    _u8L("Custom supports, seams and multimaterial painting were "
-                         "removed after repairing the mesh."));
+                    notification_msg);
 //                    _u8L("Undo the repair"),
 //                    [this, snapshot_time](wxEvtHandler*){
 //                        // Make sure the snapshot is still available and that
diff --git a/src/slic3r/GUI/Plater.hpp b/src/slic3r/GUI/Plater.hpp
index 1ecbeb190..3dcca746d 100644
--- a/src/slic3r/GUI/Plater.hpp
+++ b/src/slic3r/GUI/Plater.hpp
@@ -273,7 +273,7 @@ public:
     void reslice_FFF_until_step(PrintObjectStep step, const ModelObject &object, bool postpone_error_messages = false);
     void reslice_SLA_until_step(SLAPrintObjectStep step, const ModelObject &object, bool postpone_error_messages = false);
 
-    void clear_before_change_mesh(int obj_idx);
+    void clear_before_change_mesh(int obj_idx, const std::string &notification_msg);
     void changed_mesh(int obj_idx);
 
     void changed_object(int obj_idx);