### 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 
Color outline_color;
		Ref<Font> bold_font;
		int bold_font_size;
		Ref<Font> bold_italics_font;
		int bold_italics_font_size;
		Ref<Font> italics_font;
		int italics_font_size;
		Ref<Font> mono_font;
		int mono_font_size;
		int table_h_separation;
		int table_v_separation;
		Color table_odd_row_bg;
		Color table_even_row_bg;
		Color table_border;
		float base_scale = 1.0;
	} theme_cache;
public:
	String get_parsed_text() const;
	void add_text(const String &p_text);
	void add_image(const Ref<Texture2D> &p_image, const int p_width = 0, const int p_height = 0, const Color &p_color = Color(1.0, 1.0, 1.0), InlineAlignment p_alignment = INLINE_ALIGNMENT_CENTER, const Rect2 &p_region = Rect2(0, 0, 0, 0));
	void add_newline();
	bool remove_paragraph(const int p_paragraph);
	void push_dropcap(const String &p_string, const Ref<Font> &p_font, int p_size, const Rect2 &p_dropcap_margins = Rect2(), const Color &p_color = Color(1, 1, 1), int p_ol_size = 0, const Color &p_ol_color = Color(0, 0, 0, 0));
	void _push_def_font(DefaultFont p_def_font);
	void _push_def_font_var(DefaultFont p_def_font, const Ref<Font> &p_font, int p_size = -1);
	void push_font(const Ref<Font> &p_font, int p_size = 0);
	void push_font_size(int p_font_size);
	void push_outline_size(int p_font_size);
	void push_normal();
	void push_bold();