Child windows inherit Hidden frames setting from parent more accurately, so HiddenFramesCannotSkipItems is honored by child windows.

imgui.cpp

diff --git a/imgui.cpp b/imgui.cpp
index 1053860..5f402f7 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -5832,9 +5832,11 @@
             if (window->OuterRectClipped.Min.x >= window->OuterRectClipped.Max.x || window->OuterRectClipped.Min.y >= window->OuterRectClipped.Max.y)
                 window->HiddenFramesCanSkipItems = 1;
 
-        // Completely hide along with parent or if parent is collapsed
-        if (parent_window && (parent_window->Collapsed || parent_window->Hidden))
+        // Hide along with parent or if parent is collapsed
+        if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCanSkipItems > 0))
             window->HiddenFramesCanSkipItems = 1;
+        if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCannotSkipItems > 0))
+            window->HiddenFramesCannotSkipItems = 1;
     }
 
     // Don't render if style alpha is 0.0 at the time of Begin(). This is arbitrary and inconsistent but has been there for a long while (may remove at some point)