diff --git a/cura/Machines/Models/MaterialManagementModel.py b/cura/Machines/Models/MaterialManagementModel.py
index 8a143f46b2..f00b81e987 100644
--- a/cura/Machines/Models/MaterialManagementModel.py
+++ b/cura/Machines/Models/MaterialManagementModel.py
@@ -141,6 +141,21 @@ class MaterialManagementModel(QObject):
                 new_container.getMetaData().update(new_metadata)
             new_containers.append(new_container)
 
+        # CURA-6863: Nodes in ContainerTree will be updated upon ContainerAdded signals, one at a time. It will use the
+        # best fit material container at the time it sees one. For example, if you duplicate and get generic_pva #2,
+        # if the node update function sees the containers in the following order:
+        #
+        #   - generic_pva #2
+        #   - generic_pva #2_um3_aa04
+        #
+        # It will first use "generic_pva #2" because that's the best fit it has ever seen, and later "generic_pva #2_um3_aa04"
+        # once it sees that. Because things run in the Qt event loop, they don't happen at the same time. This means if
+        # between those two events, the ContainerTree will have nodes that contain invalid data.
+        #
+        # This sort fixes the problem by emitting the most specific containers first.
+        new_containers = sorted(new_containers, key = lambda x: x.getId(), reverse = True)
+
+        # Optimization. Serving the same purpose as the postponeSignals() in removeMaterial()
         # postpone the signals emitted when duplicating materials. This is easier on the event loop; changes the
         # behavior to be like a transaction. Prevents concurrency issues.
         with postponeSignals(container_registry.containerAdded, compress=CompressTechnique.CompressPerParameterValue):
diff --git a/cura/Machines/VariantNode.py b/cura/Machines/VariantNode.py
index efe15dbec2..1c5474422e 100644
--- a/cura/Machines/VariantNode.py
+++ b/cura/Machines/VariantNode.py
@@ -1,15 +1,18 @@
 # Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
-
 from typing import Optional, TYPE_CHECKING
 
 from UM.Logger import Logger
 from UM.Settings.ContainerRegistry import ContainerRegistry
 from UM.Settings.Interfaces import ContainerInterface
 from UM.Signal import Signal
+
+from cura.Settings.cura_empty_instance_containers import empty_variant_container
 from cura.Machines.ContainerNode import ContainerNode
 from cura.Machines.MaterialNode import MaterialNode
+
 import UM.FlameProfiler
+
 if TYPE_CHECKING:
     from typing import Dict
     from cura.Machines.MachineNode import MachineNode
@@ -119,18 +122,18 @@ class VariantNode(ContainerNode):
         if base_file not in self.materials:  # Completely new base file. Always better than not having a file as long as it matches our set-up.
             if material_definition != "fdmprinter" and material_definition != self.machine.container_id:
                 return
-            material_variant = container.getMetaDataEntry("variant_name", "empty")
-            if material_variant != "empty" and material_variant != self.variant_name:
+            material_variant = container.getMetaDataEntry("variant_name", empty_variant_container.getName())
+            if material_variant != self.variant_name:
                 return
         else:  # We already have this base profile. Replace the base profile if the new one is more specific.
             new_definition = container.getMetaDataEntry("definition")
             if new_definition == "fdmprinter":
                 return  # Just as unspecific or worse.
-            if new_definition != self.machine.container_id:
+            material_variant = container.getMetaDataEntry("variant_name")
+            if new_definition != self.machine.container_id or material_variant != self.variant_name:
                 return  # Doesn't match this set-up.
             original_metadata = ContainerRegistry.getInstance().findContainersMetadata(id = self.materials[base_file].container_id)[0]
-            original_variant = original_metadata.get("variant_name", "empty")
-            if original_variant != "empty" or container.getMetaDataEntry("variant_name", "empty") == "empty":
+            if "variant_name" in original_metadata or material_variant is None:
                 return  # Original was already specific or just as unspecific as the new one.
 
         if "empty_material" in self.materials:
diff --git a/cura/PrinterOutput/Models/ExtruderConfigurationModel.py b/cura/PrinterOutput/Models/ExtruderConfigurationModel.py
index 04a3c95afd..4a1cf4916f 100644
--- a/cura/PrinterOutput/Models/ExtruderConfigurationModel.py
+++ b/cura/PrinterOutput/Models/ExtruderConfigurationModel.py
@@ -25,9 +25,10 @@ class ExtruderConfigurationModel(QObject):
         return self._position
 
     def setMaterial(self, material: Optional[MaterialOutputModel]) -> None:
-        if self._material != material:
-            self._material = material
-            self.extruderConfigurationChanged.emit()
+        if material is None or self._material == material:
+            return
+        self._material = material
+        self.extruderConfigurationChanged.emit()
 
     @pyqtProperty(QObject, fset = setMaterial, notify = extruderConfigurationChanged)
     def activeMaterial(self) -> Optional[MaterialOutputModel]:
diff --git a/resources/qml/Preferences/Materials/MaterialsList.qml b/resources/qml/Preferences/Materials/MaterialsList.qml
index 96f6730029..8b82a87820 100644
--- a/resources/qml/Preferences/Materials/MaterialsList.qml
+++ b/resources/qml/Preferences/Materials/MaterialsList.qml
@@ -114,7 +114,7 @@ Item
             if (base.toActivateNewMaterial)
             {
                 var position = Cura.ExtruderManager.activeExtruderIndex
-                Cura.MachineManager.setMaterial(position, base.currentItem.container_node)
+                Cura.MachineManager.setMaterialById(position, base.newRootMaterialIdToSwitchTo)
             }
             base.newRootMaterialIdToSwitchTo = ""
             base.toActivateNewMaterial = false
diff --git a/resources/qml/Preferences/Materials/MaterialsTypeSection.qml b/resources/qml/Preferences/Materials/MaterialsTypeSection.qml
index 2c1e2128e1..3c36e12651 100644
--- a/resources/qml/Preferences/Materials/MaterialsTypeSection.qml
+++ b/resources/qml/Preferences/Materials/MaterialsTypeSection.qml
@@ -21,6 +21,7 @@ Item
     property var colorsModel: materialType != null ? materialType.colors: null
     height: childrenRect.height
     width: parent.width
+    anchors.left: parent.left
     Rectangle
     {
         id: material_type_header_background