after i use plus button create a scene, and then click other window , godot will show a Progress bar to save and then i can`t click anything

### Tested versions

4.2.1.stable

### System information

win10 -4.2.1.stable - compatible - fullscreen -OpenGL API 3.3.0 NVIDIA 545.92 - Compatibility - Using Device: NVIDIA - NVIDIA GeForce RTX 4060 Laptop GPU

### Issue description

in fullscreen, after i create a scene and then i click other whindow there will show a Progress bar quickly, then every thing can`t click

### Steps to reproduce

in fullscreen, after i create a scene and then i click other whindow there will show a Progress bar quickly, then every thing can`t click

### Minimal reproduction project (MRP)

[example.zip](https://github.com/godotengine/godot/files/14589483/example.zip)

Start by opening example.zip in Godot 4.2.1 on Windows 10, then reproduce the fullscreen workflow: create a scene, switch to another window, and observe the progress bar and blocked editor. Trace the editor's scene-saving and window-focus behavior to identify why input remains blocked, and verify that the editor is usable after reproducing the sequence.

Written by the indexing model from the issue text.