### Godot version

4.0.2.stable

### System information

Manjaro Linux 5.15.113-1-MANJARO

### Issue description

When I was trying to figure out #77725 i stumbled upon this:
![image](https://github.com/godotengine/godot/assets/14893831/364b89ce-00b2-4aef-a85e-f10c16936005)

pressing enter results in 
![image](https://github.com/godotengine/godot/assets/14893831/07d53b82-c919-4635-80e2-e1809b6bb11f)


It looks simmilar to #48436 , but it started happening to every code completion and I have absolutely no clue how it happened.

It happened after I moved(using shift+arrow keys to select, tab to indent and alt+arrow keys to move down)  the three dicts in the picture to within the function and added the dict 4.

### Steps to reproduce

Here's roughly what I did 
(might be slightly inaccurate, I was basically messing around to try and see the scope of $77725 when it happened)

1) create an empty script
2) declare a couple of dictionaries
3) declare a function
4) try out code completion within the function
5) create a lambda within the function and try 4) again
6) move the dictionaries' declaration within the function using keyboard shortcuts and try 4)




### Minimal reproduction project

N/A
CHECK(code_edit->get_line(1) == "new line");
	
	code_edit->set_text("");
	code_edit->insert_text_at_caret("test new line");
	code_edit->select(0, 0, 0, 5);
	SEND_GUI_ACTION("ui_text_newline_blank");
	CHECK(code_edit->get_line(0) == "test new line");
	CHECK(code_edit->get_line(1) == "");
	
	code_edit->set_text("");
	code_edit->insert_text_at_caret("test new line");
	code_edit->select(0, 0, 0, 5);
	SEND_GUI_ACTION("ui_text_newline_above");
	CHECK(code_edit->get_line(0) == "");
	CHECK(code_edit->get_line(1) == "test new line");
	memdelete(code_edit);
}
TEST_CASE("[SceneTree][CodeEdit] Duplicate Lines") {
	CodeEdit *code_edit = memnew(CodeEdit);
	SceneTree::get_singleton()->get_root()->add_child(code_edit);
	code_edit->grab_focus();
	code_edit->set_text(R"(extends Node
func _ready():
	var a := len(OS.get_cmdline_args())
	var b := get_child_count()
	var c := a + b
	for i in range(c):
		print("This is the solution: ", sin(i))
	var pos = get_index() - 1
	print("Make sure this exits: %b" % pos)