Pressing Windows+↓ in fullscreen mode incorrectly restores the game window to a borderless windowed state

When the game is maximized using Win + ↑ and then entered into fullscreen mode via F11 or the fullscreen button (or vice versa), pressing Win + ↓ causes the game to incorrectly revert to a borderless windowed state at the size it was before being maximized, even though it remains technically in fullscreen mode.

Before 26.3-pre-2 (MC-310300 dosen’t fixed), you can switching to another application and then switching back to restores the correct fullscreen display. After MC-310300 fixed, you cannot switching to another application and then switching back to restores the correct fullscreen display.
Steps to Reproduce:
Ensure the game is in a non-maximized windowed state before starting.
Method 1:
1. Press Win + ↑ to maximize the window.
2. Press F11 to enter fullscreen mode.
3. Press Win + ↓.
Method 2:
1. Double-click the top edge of the window to maximize it.
2. Press F11 to enter fullscreen mode.
3. Press Win + ↑.
4. Press Win + ↓.
Expected Result:

Pressing Win + ↓ while in fullscreen mode should not cause the game to incorrectly revert to a borderless windowed state.
Observed Result:

Pressing Win + ↓ while in fullscreen mode causes the game to incorrectly revert to a borderless windowed state at the pre-maximization size.
Additional Information:
1. This issue does not occur when Exclusive Fullscreen is enabled.
2. This issue may have existed in earlier versions as well.