### 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
code_region_start_string = "";
	code_region_end_string = "";
	if (code_region_start_tag.is_empty() || code_region_end_tag.is_empty()) {
		return;
	}
	
	for (int i = delimiters.size() - 1; i >= 0; i--) {
		if (delimiters[i].type != DelimiterType::TYPE_COMMENT) {
			continue;
		}
		if (delimiters[i].end_key.is_empty() && delimiters[i].line_only == true) {
			code_region_start_string = delimiters[i].start_key + code_region_start_tag;
			code_region_end_string = delimiters[i].start_key + code_region_end_tag;
			return;
		}
	}
}
void CodeEdit::_update_delimiter_cache(int p_from_line, int p_to_line) {
	if (delimiters.size() == 0) {
		return;
	}
	int line_count = get_line_count();
	if (p_to_line == -1) {
		p_to_line = line_count;
	}
	int start_line = MIN(p_from_line, p_to_line);
	int end_line = MAX(p_from_line, p_to_line);
	
	if (start_line != end_line) {