https://bugreports.qt.io/browse/QTBUG-141099
https://codereview.qt-project.org/c/qt/qtbase/+/685911
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -3418,4 +3418,13 @@
     QWindowPrivate *p = qt_window_private(window);
 
+    if (e->isExposed) {
+        // If the window has been automatically positioned or resized by the
+        // window manager, we now assume those have taken effect, even for
+        // asynchronous window managers. From this point on we want the window
+        // to keep its geometry, even when recreated.
+        p->positionAutomatic = false;
+        p->resizeAutomatic = false;
+    }
+
     if (!p->receivedExpose) {
         if (p->resizeEventPending) {
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -587,10 +587,4 @@
     platformWindow->initialize();
 
-    // Now that the window is created and initialized the platform has had
-    // a chance to position and size it automatically. From this point on
-    // we want the window to keep its geometry, even when recreated.
-    positionAutomatic = false;
-    resizeAutomatic = false;
-
     QObjectList childObjects = q->children();
     for (int i = 0; i < childObjects.size(); i ++) {