### Godot version

master ([06ccbfe](https://github.com/godotengine/godot/commit/06ccbfe8eec6e840db3df2360dc2804386f940b8))

### System information

PopOS 22.04

### Issue description

Sometimes the doc page is broken when the engine is closed and then restarted.
Closing the doc and opening it again fixes it.

![2023-05-27_22-15](https://github.com/godotengine/godot/assets/3624853/ed202a55-03e8-420a-bc1c-ccfc7f7cd02a)


### Steps to reproduce

- Open a documentation page for any node
- Restart Godot

### Minimal reproduction project

NA

EDIT : Added the commit hash @Calinou 
font = font_data;
							def_font = CUSTOM_FONT;
						}
					} else if (subtag_a[0] == "size" || subtag_a[0] == "s") {
						fnt_size = subtag_a[1].to_int();
					} else if (subtag_a[0] == "glyph_spacing" || subtag_a[0] == "gl") {
						int spacing = subtag_a[1].to_int();
						fc->set_spacing(TextServer::SPACING_GLYPH, spacing);
					} else if (subtag_a[0] == "space_spacing" || subtag_a[0] == "sp") {
						int spacing = subtag_a[1].to_int();
						fc->set_spacing(TextServer::SPACING_SPACE, spacing);
					} else if (subtag_a[0] == "top_spacing" || subtag_a[0] == "top") {
						int spacing = subtag_a[1].to_int();
						fc->set_spacing(TextServer::SPACING_TOP, spacing);
					} else if (subtag_a[0] == "bottom_spacing" || subtag_a[0] == "bt") {
						int spacing = subtag_a[1].to_int();
						fc->set_spacing(TextServer::SPACING_BOTTOM, spacing);
					} else if (subtag_a[0] == "embolden" || subtag_a[0] == "emb") {
						float emb = subtag_a[1].to_float();
						fc->set_variation_embolden(emb);
					} else if (subtag_a[0] == "face_index" || subtag_a[0] == "fi") {
						int fi = subtag_a[1].to_int();
						fc->set_variation_face_index(fi);
					} else if (subtag_a[0] == "slant" || subtag_a[0] == "sln") {
						float slant = subtag_a[1].to_float();
						fc->set_variation_transform(Transform2D(1.0, slant, 0.0, 1.0, 0.0, 0.0));
					} else if (subtag_a[0] == "opentype_variation" || subtag_a[0] == "otv") {
						Dictionary variations;
						if (!subtag_a[1].is_empty()) {
							Vector<String> variation_tags = subtag_a[1].split(",");