diff --git a/docs/changelog.rst b/docs/changelog.rst
index 0d4bdb471..15ee4a5e4 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -184,6 +184,9 @@ Detailed list of changes
 - Wayland: Fix spurious key repeat events when some user defined callback takes
   a long time to execute (:iss:`9224`)
 
+- When moving windows to a new tab/OS Window fix overlay windows not being
+  grouped with their parent windows (:iss:`9266`)
+
 0.44.0 [2025-11-03]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/kitty/boss.py b/kitty/boss.py
index f350f7508..90ca93a60 100644
--- a/kitty/boss.py
+++ b/kitty/boss.py
@@ -3079,8 +3079,11 @@ class Boss:
                     else:
                         return
 
+            overlay_for = 0
             for detached_window in src_tab.detach_window(window):
-                target_tab.attach_window(detached_window)
+                target_tab.attach_window(detached_window, overlay_for=overlay_for)
+                if overlay_for == 0:
+                    overlay_for = detached_window.id
             self._cleanup_tab_after_window_removal(src_tab)
             target_tab.make_active()
 
diff --git a/kitty/tabs.py b/kitty/tabs.py
index 4c22ee15a..693d89ead 100644
--- a/kitty/tabs.py
+++ b/kitty/tabs.py
@@ -752,10 +752,10 @@ class Tab:  # {{{
             self.remove_window(w, destroy=False)
         return tuple(windows)
 
-    def attach_window(self, window: Window) -> None:
+    def attach_window(self, window: Window, overlay_for: int = 0) -> None:
         window.change_tab(self)
         attach_window(self.os_window_id, self.id, window.id)
-        self._add_window(window)
+        self._add_window(window, overlay_for=overlay_for)
 
     def set_active_window(self, x: Window | int, for_keep_focus: Window | None = None) -> None:
         self.windows.set_active_window_group_for(x, for_keep_focus=for_keep_focus)