Steps to reproduce:
1. Open three windows.
2. Split one window on the left side of the screen (with Super+Left, or by dragging it to the left of the screen).
3. Split another on the right of the screen.
4. Drag-and-drop the remaining, un-split window on top of the right-split window.
5. Focus on the left-split window (by clicking on it, by Alt+Tabbing to it, etc).

Expected results:
After focusing on the left-split window, the un-split window should still be visible, appearing "in front" of the right-split window.

Actual results:
The right-split window will appear "in front" of the un-split window, obscuring it completely, despite the fact that the right-split window was not interacted with. This happens on both Wayland and Xorg.


In other words, when one window is split on the left, and another is split on the right, focusing on one of the two split windows makes the other one get raised above any other windows on the desktop.

If this is an intentional feature, there should at least be an easily-discoverable switch for it somewhere, like a well-named dconf setting, or an entry in Tweaks.