### Godot version

4.0 dev Beta 10

### System information

MacBook Pro M1 Max

### Issue description

After I imported font.ttf file and move it from one folder to another under ://res godot suddenly crashed, and it still crashes after restart.

### Steps to reproduce

Import some font.ttf file and try to move into different folder

### Minimal reproduction project

N/A
FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, Size2());
	MutexLock lock(fd->mutex);
	Vector2i size = _get_size_outline(fd, p_size);
	ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), Size2());
	int mod = 0;
	if (fd->antialiasing == FONT_ANTIALIASING_LCD) {
		TextServer::FontLCDSubpixelLayout layout = (TextServer::FontLCDSubpixelLayout)(int)GLOBAL_GET("gui/theme/lcd_subpixel_layout");
		if (layout != FONT_LCD_SUBPIXEL_LAYOUT_NONE) {
			mod = (layout << 24);
		}
	}
	if (!_ensure_glyph(fd, size, p_glyph | mod)) {
		return Size2(); 
	}
	const HashMap<int32_t, FontGlyph> &gl = fd->cache[size]->glyph_map;
	ERR_FAIL_COND_V(gl[p_glyph | mod].texture_idx < -1 || gl[p_glyph | mod].texture_idx >= fd->cache[size]->textures.size(), Size2());
	if (RenderingServer::get_singleton() != nullptr) {
		if (gl[p_glyph | mod].texture_idx != -1) {
			if (fd->cache[size]->textures[gl[p_glyph | mod].texture_idx].dirty) {
				ShelfPackTexture &tex = fd->cache[size]->textures.write[gl[p_glyph | mod].texture_idx];
				Ref<Image> img = Image::create_from_data(tex.texture_w, tex.texture_h, false, tex.format, tex.imgdata);
				if (fd->mipmaps) {
					img->generate_mipmaps();
				}
				if (tex.texture.is_null()) {
					tex.texture = ImageTexture::create_from_image(img);
				} else {
					tex.texture->update(img);
				}