### Godot version

4.0 dev_build

### System information

Ubuntu 22.04.1

### Issue description

The "Lookup Symbol" button don't appears for custorm class names.
Related issues: #68475,  #73167.
I tried apply #68311, #69473 and #73196. It don't helps.
The `Ctrl+LMB` works right for all cases.

### Steps to reproduce

Right click to the `CustomClassA` symbol in the `custom_class_b.gd` anywhere. The `Lookup Symbol` button don't appears in the context menu.

### Minimal reproduction project

Example from  #68475.
String symbol_lookup_word = "";
	Point2i symbol_lookup_pos;
	
	struct ThemeCache {
		
		Color code_folding_color = Color(1, 1, 1);
		Ref<Texture2D> can_fold_icon;
		Ref<Texture2D> folded_icon;
		Ref<Texture2D> folded_eol_icon;
		Color breakpoint_color = Color(1, 1, 1);
		Ref<Texture2D> breakpoint_icon = Ref<Texture2D>();
		Color bookmark_color = Color(1, 1, 1);
		Ref<Texture2D> bookmark_icon = Ref<Texture2D>();
		Color executing_line_color = Color(1, 1, 1);
		Ref<Texture2D> executing_line_icon = Ref<Texture2D>();
		Color line_number_color = Color(1, 1, 1);
		
		Ref<StyleBox> code_completion_style;
		int code_completion_icon_separation = 0;
		int code_completion_max_width = 0;
		int code_completion_max_lines = 7;
		int code_completion_scroll_width = 0;
		Color code_completion_scroll_color = Color(0, 0, 0, 0);
		Color code_completion_scroll_hovered_color = Color(0, 0, 0, 0);
		Color code_completion_background_color = Color(0, 0, 0, 0);
		Color code_completion_selected_color = Color(0, 0, 0, 0);
		Color code_completion_existing_color = Color(0, 0, 0, 0);
		
		Ref<StyleBox> code_hint_style;
		Color code_hint_color;