### 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)

uint32_t pack_flags = 0;
	bool enc_pck = p_preset->get_enc_pck();
	bool enc_directory = p_preset->get_enc_directory();
	if (enc_pck && enc_directory) {
		pack_flags |= PACK_DIR_ENCRYPTED;
	}
	f->store_32(pack_flags); 
	uint64_t file_base_ofs = f->get_position();
	f->store_64(0); 
	for (int i = 0; i < 16; i++) {
		
		f->store_32(0);
	}
	f->store_32(pd.file_ofs.size()); 
	Ref<FileAccessEncrypted> fae;
	Ref<FileAccess> fhead = f;
	if (enc_pck && enc_directory) {
		String script_key = _get_script_encryption_key(p_preset);
		Vector<uint8_t> key;
		key.resize(32);
		if (script_key.length() == 64) {
			for (int i = 0; i < 32; i++) {
				int v = 0;
				if (i * 2 < script_key.length()) {
					char32_t ct = script_key[i * 2];
					if (is_digit(ct)) {
						ct = ct - '0';
					} else if (ct >= 'a' && ct <= 'f') {
						ct = 10 + ct - 'a';
					}