### 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
ERR_FAIL_INDEX_MSG(caret_column, line.length() + 1, "Caret column exceeds line length.");
	if (caret_column > 0 && line[caret_column - 1] == '(' && !code_completion_forced) {
		cancel_code_completion();
		return;
	}
	
	int in_string = is_in_string(caret_line, caret_column);
	int first_quote_col = -1;
	if (in_string != -1) {
		Point2 string_start_pos = get_delimiter_start_position(caret_line, caret_column);
		first_quote_col = (string_start_pos.y == caret_line) ? string_start_pos.x : -1;
	} else if (caret_column > 0) {
		if (is_in_string(caret_line, caret_column - 1) != -1) {
			first_quote_col = caret_column - 1;
		}
	}
	int cofs = caret_column;
	String string_to_complete;
	bool prev_is_word = false;
	
	if (caret_column > 0 && in_string == -1 && first_quote_col == cofs - 1) {
		cancel_code_completion();
		return;
		
	} else if (in_string != -1 && first_quote_col != -1) {
		int key_length = delimiters[in_string].start_key.length();
		string_to_complete = line.substr(first_quote_col - key_length, (cofs - first_quote_col) + key_length);
		
	} else if (cofs > 0 && line[cofs - 1] == ' ') {
		int ofs = cofs - 1;