### 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)

encode_uint32(ofs, &ret.write[string_table_begins + i * 4]);
		ofs += string_table[i].length() * 2 + 2 + 2;
	}
	ret.resize(ret.size() + ofs);
	string_data_offset = ret.size() - ofs;
	uint8_t *chars = &ret.write[string_data_offset];
	for (int i = 0; i < string_table.size(); i++) {
		String s = string_table[i];
		encode_uint16(s.length(), chars);
		chars += 2;
		for (int j = 0; j < s.length(); j++) {
			encode_uint16(s[j], chars);
			chars += 2;
		}
		encode_uint16(0, chars);
		chars += 2;
	}
	for (int i = 0; i < stable_extra.size(); i++) {
		ret.push_back(stable_extra[i]);
	}
	
	while (ret.size() % 4) {
		ret.push_back(0);
	}
	uint32_t new_stable_end = ret.size();
	uint32_t extra = (p_manifest.size() - string_table_ends);
	ret.resize(new_stable_end + extra);
	for (uint32_t i = 0; i < extra; i++) {
		ret.write[new_stable_end + i] = p_manifest[string_table_ends + i];
	}