Customize single.php whit new name

Hi team, thanks in advance.

I just copied single.php from ENFOLD folder to ENFOLD-CHILD folder as phb-tbwa-single-post.php and in the top of php i write:

<?php
/*
	 Template Name: Single Post
   Template Post Type: post
*/

Is the same file as single.php but with this extra name to appear in the selected list of templates in POST ENTRY.

The problem is that the content is different when I use one of both.

Here is the video file with the problem
https://drive.google.com/file/d/13-X3gCsNpuK2bEM2H8dhmdbtOb6B1kyp/view?usp=sharing

Thanks.