### 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)

result.resize(src_len * 1.25); 
	int res_size = 0;
	uint8_t buf[128];
	int buf_size = 0;
	int i = 0;
	while (i < src_len) {
		uint8_t cur = p_source.ptr()[i * 4 + p_ch];
		if (i < src_len - 2) {
			if ((p_source.ptr()[(i + 1) * 4 + p_ch] == cur) && (p_source.ptr()[(i + 2) * 4 + p_ch] == cur)) {
				if (buf_size > 0) {
					result.write[res_size++] = (uint8_t)(buf_size - 1);
					memcpy(&result.write[res_size], &buf, buf_size);
					res_size += buf_size;
					buf_size = 0;
				
				uint8_t lim = i + 130 >= src_len ? src_len - i - 1 : 130;
				bool hit_lim = true;
				for (int j = 3; j <= lim; j++) {
					if (p_source.ptr()[(i + j) * 4 + p_ch] != cur) {
						hit_lim = false;
						i = i + j - 1;
						result.write[res_size++] = (uint8_t)(j - 3 + 0x80);
						result.write[res_size++] = cur;
						break;
					
				
				if (hit_lim) {
					result.write[res_size++] = (uint8_t)(lim - 3 + 0x80);
					result.write[res_size++] = cur;
					i = i + lim;