diff --git a/plugins/3MFReader/ThreeMFWorkspaceReader.py b/plugins/3MFReader/ThreeMFWorkspaceReader.py
index c8d1c85273..6de4ddc998 100755
--- a/plugins/3MFReader/ThreeMFWorkspaceReader.py
+++ b/plugins/3MFReader/ThreeMFWorkspaceReader.py
@@ -378,7 +378,11 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
             Logger.log("e", "Could not find 'metadata/position' in extruder stack file")
             raise RuntimeError(msg)
         extruder_position = extruder_config.get("metadata", "position")
-        extruder_stack = global_stack.extruders[extruder_position]
+        try:
+            extruder_stack = global_stack.extruders[extruder_position]
+        except KeyError:
+            Logger.log("w", "Could not find the matching extruder stack to override for position %s", extruder_position)
+            return None
 
         # Override the given extruder stack
         extruder_stack.deserialize(extruder_file_content)
@@ -701,6 +705,8 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                     if global_stack.getProperty("machine_extruder_count", "value") > 1:
                         # deserialize new extruder stack over the current ones (if any)
                         stack = self._overrideExtruderStack(global_stack, extruder_file_content)
+                        if stack is None:
+                            continue
 
                 elif self._resolve_strategies["machine"] == "new":
                     new_id = extruder_stack_id_map[container_id]
diff --git a/resources/qml/Topbar.qml b/resources/qml/Topbar.qml
index 152a677467..b3a5137111 100644
--- a/resources/qml/Topbar.qml
+++ b/resources/qml/Topbar.qml
@@ -18,8 +18,6 @@ Rectangle
     height: UM.Theme.getSize("sidebar_header").height
     color: base.monitoringPrint ? UM.Theme.getColor("topbar_background_color_monitoring") : UM.Theme.getColor("topbar_background_color")
 
-    Behavior on color { ColorAnimation { duration: 100; } }
-
     property bool printerConnected: Cura.MachineManager.printerOutputDevices.length != 0
     property bool printerAcceptsCommands: printerConnected && Cura.MachineManager.printerOutputDevices[0].acceptsCommands
     property bool monitoringPrint: false
diff --git a/resources/themes/cura-dark/theme.json b/resources/themes/cura-dark/theme.json
index f39fe96c37..e61c48bffd 100644
--- a/resources/themes/cura-dark/theme.json
+++ b/resources/themes/cura-dark/theme.json
@@ -16,7 +16,7 @@
         "secondary": [241, 242, 242, 255],
 
         "topbar_background_color": [0, 0, 0, 0],
-        "topbar_background_color_monitoring": [0, 0, 0, 0],
+        "topbar_background_color_monitoring": [31, 36, 39, 255],
 
         "topbar_button_text_active": [255, 255, 255, 255],
         "topbar_button_text_inactive": [128, 128, 128, 255],
diff --git a/resources/themes/cura-light/theme.json b/resources/themes/cura-light/theme.json
index 5d50618eea..96ccd469b6 100644
--- a/resources/themes/cura-light/theme.json
+++ b/resources/themes/cura-light/theme.json
@@ -68,7 +68,7 @@
         "secondary": [245, 245, 245, 255],
 
         "topbar_background_color": [255, 255, 255, 0],
-        "topbar_background_color_monitoring": [255, 255, 255, 0],
+        "topbar_background_color_monitoring": [255, 255, 255, 255],
 
         "topbar_button_text_active": [0, 0, 0, 255],
         "topbar_button_text_inactive": [128, 128, 128, 255],