diff --git a/src/platformsupport/scenes/opengl/basiceglsurfacetexture_wayland.cpp b/src/platformsupport/scenes/opengl/basiceglsurfacetexture_wayland.cpp
index 44bb8604b9..022626cda7 100644
--- a/src/platformsupport/scenes/opengl/basiceglsurfacetexture_wayland.cpp
+++ b/src/platformsupport/scenes/opengl/basiceglsurfacetexture_wayland.cpp
@@ -41,6 +41,7 @@ bool BasicEGLSurfaceTextureWayland::create()
     } else if (m_pixmap->buffer()->shmAttributes()) {
         return loadShmTexture(m_pixmap->buffer());
     } else {
+        qCDebug(KWIN_OPENGL) << "Failed to create BasicEGLSurfaceTextureWayland for a buffer of unknown type" << m_pixmap->buffer();
         return false;
     }
 }
@@ -57,6 +58,8 @@ void BasicEGLSurfaceTextureWayland::update(const QRegion &region)
         updateDmabufTexture(m_pixmap->buffer());
     } else if (m_pixmap->buffer()->shmAttributes()) {
         updateShmTexture(m_pixmap->buffer(), region);
+    } else {
+        qCDebug(KWIN_OPENGL) << "Failed to update BasicEGLSurfaceTextureWayland for a buffer of unknown type" << m_pixmap->buffer();
     }
 }
 
diff --git a/src/wayland/display.cpp b/src/wayland/display.cpp
index cbf95f103f..82b7d09324 100644
--- a/src/wayland/display.cpp
+++ b/src/wayland/display.cpp
@@ -238,6 +238,7 @@ GraphicsBuffer *Display::bufferForResource(wl_resource *resource)
     } else if (auto buffer = ShmClientBuffer::get(resource)) {
         return buffer;
     } else {
+        Q_ASSERT_X(false, Q_FUNC_INFO, "Failed to find matching GraphicsBuffer for wl_resource");
         return nullptr;
     }
 }