diff --git a/shell/panelview.cpp b/shell/panelview.cpp
--- a/shell/panelview.cpp
+++ b/shell/panelview.cpp
@@ -1004,7 +1004,8 @@
 
 void PanelView::updateMask()
 {
-    if (m_backgroundHints == Plasma::Types::NoBackground) {
+    auto casted = qobject_cast<QQuickItem*>(this->rootObject());
+    if (m_backgroundHints == Plasma::Types::NoBackground || (casted && (casted->state() == QStringLiteral("opaque")))) {
         KWindowEffects::enableBlurBehind(winId(), false);
         KWindowEffects::enableBackgroundContrast(winId(), false);
         setMask(QRegion());