UPD?

Shell/Overlays/MprisOverlay.qml

@@ -31,6 +31,10 @@ PanelWindow {
             id: songItem
 
             property bool linger: false
+            function showSongOverlay() {
+                linger = true;
+                hideTimer.restart();
+            }
 
             Timer {
                 id: hideTimer
@@ -39,15 +43,31 @@ PanelWindow {
                 onTriggered: songItem.linger = false
             }
 
-            property bool hasSong: (index === 0 && modelData.dbusName.startsWith("org.mpris.MediaPlayer2.chromium.instance") && modelData.trackTitle !== "" && modelData.trackArtist !== "")
+            property string artistText: {
+                if (modelData.trackArtist === undefined || modelData.trackArtist === null)
+                    return "";
+                const text = String(modelData.trackArtist);
+                return text === "" ? "" : text;
+            }
+            property bool hasSong: modelData.trackTitle !== ""
+            property string displayText: {
+                if (!hasSong)
+                    return "";
+                if (artistText !== "")
+                    return "♪ " + artistText + " - " + modelData.trackTitle;
+                return "♪ " + modelData.trackTitle;
+            }
 
             property bool active: hasSong && linger
 
             onHasSongChanged: {
-                if (hasSong) {
-                    linger = true;
-                    hideTimer.restart();
-                }
+                if (hasSong)
+                    showSongOverlay();
+            }
+
+            onDisplayTextChanged: {
+                if (hasSong)
+                    showSongOverlay();
             }
 
             visible: opacity > 0
@@ -116,7 +136,7 @@ PanelWindow {
             Text {
                 x: 1
                 y: 1
-                text: "♪ " + modelData.trackArtist + " - " + modelData.trackTitle
+                text: songItem.displayText
                 font.family: "8bitoperator JVE"
                 font.pixelSize: 32
                 font.letterSpacing: 1
@@ -130,7 +150,7 @@ PanelWindow {
             Text {
                 x: 0
                 y: 0
-                text: "♪ " + modelData.trackArtist + " - " + modelData.trackTitle
+                text: songItem.displayText
                 font.family: "8bitoperator JVE"
                 font.pixelSize: 32
                 font.letterSpacing: 1

Shell/Windows/QuickSettings/QuickSettingsApp.qml

@@ -38,8 +38,12 @@ Item {
     }
 
     function menuLength() {
+        if (root.inBluetoothMenu && bluetoothRepeater)
+            return bluetoothRepeater.count;
         if (!menuModel)
             return 0;
+        if (typeof menuModel.count === "function")
+            return menuModel.count();
         if (menuModel.count !== undefined)
             return menuModel.count;
         if (menuModel.length !== undefined)