### Tested versions

Godot Engine v4.2.stable.official.46dc27791

### System information

Windows 10

### Issue description

When exporting to web, Godot fails with this error in the console:

> scene/main/window.cpp:884 - Attempting to make child window exclusive, but the parent window already has another exclusive child. This window: /root/@<!-- -->EditorNode@<!-- -->17120/@<!-- -->Panel@<!-- -->13/@<!-- -->ProjectExportDialog@<!-- -->559/@<!-- -->VBoxContainer@<!-- -->137/@<!-- -->AcceptDialog@<!-- -->411, parent window: /root/@<!-- -->EditorNode@<!-- -->17120/@<!-- -->Panel@<!-- -->13/@<!-- -->ProjectExportDialog@<!-- -->559, current exclusive child window: /root/@<!-- -->EditorNode@<!-- -->17120/@<!-- -->Panel@<!-- -->13/@<!-- -->ProjectExportDialog@<!-- -->559/@<!-- -->ProgressDialog@<!-- -->17444

![a](https://github.com/godotengine/godot/assets/2000051/bf9d22aa-d3fe-4e11-bff6-c387e740fe90)

This happens for newly created empty projects.


### Steps to reproduce

1. Open the attached project (or create a new project).
2. Project->Export->Export All
3. Observe the console error.  No output files are generated.


### Minimal reproduction project (MRP)

[export_test.zip](https://github.com/godotengine/godot/files/13574810/export_test.zip)

return OK;
}
void EditorExportPlatformPC::set_name(const String &p_name) {
	name = p_name;
}
void EditorExportPlatformPC::set_os_name(const String &p_name) {
	os_name = p_name;
}
void EditorExportPlatformPC::set_logo(const Ref<Texture2D> &p_logo) {
	logo = p_logo;
}
void EditorExportPlatformPC::get_platform_features(List<String> *r_features) const {
	r_features->push_back("pc"); 
	r_features->push_back("s3tc"); 
	r_features->push_back(get_os_name().to_lower()); 
}
void EditorExportPlatformPC::resolve_platform_feature_priorities(const Ref<EditorExportPreset> &p_preset, HashSet<String> &p_features) {
}
int EditorExportPlatformPC::get_chmod_flags() const {
	return chmod_flags;
}
void EditorExportPlatformPC::set_chmod_flags(int p_flags) {
	chmod_flags = p_flags;
}