Custom template is not showing up in templates dropdown list after re-naming it

I found it out myself just after playing around with it. Apprently I can’t have my_template_file_1.php too deep in the folder structure. I could have it in myTheme/templates/my_template_file_1.php but if I put it in myTheme/templates/my_template_1/my_template_file_1.php it dissapeared from the templates dropdown.