### 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.
set_title(TTR("Connections to method:"));
	VBoxContainer *vbc = memnew(VBoxContainer);
	vbc->set_anchor_and_offset(SIDE_LEFT, Control::ANCHOR_BEGIN, 8 * EDSCALE);
	vbc->set_anchor_and_offset(SIDE_TOP, Control::ANCHOR_BEGIN, 8 * EDSCALE);
	vbc->set_anchor_and_offset(SIDE_RIGHT, Control::ANCHOR_END, -8 * EDSCALE);
	vbc->set_anchor_and_offset(SIDE_BOTTOM, Control::ANCHOR_END, -8 * EDSCALE);
	add_child(vbc);
	method = memnew(Label);
	method->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_CENTER);
	vbc->add_child(method);
	tree = memnew(Tree);
	tree->set_columns(3);
	tree->set_hide_root(true);
	tree->set_column_titles_visible(true);
	tree->set_column_title(0, TTR("Source"));
	tree->set_column_title(1, TTR("Signal"));
	tree->set_column_title(2, TTR("Target"));
	vbc->add_child(tree);
	tree->set_v_size_flags(Control::SIZE_EXPAND_FILL);
	tree->set_allow_rmb_select(true);
}
Vector<String> ScriptTextEditor::get_functions() {