Q getTemplate() - why it works diffferently

[Jimmi08]

I have theme when template for news grid menu is the same as default news template.

I wanted to save time (or editing) and I did this:

Grid menu tepmplate:
$NEWS_GRID_TEMPLATE['col-md-4'] - normal code
News template:
$grid_templates = e107::getTemplate('news', 'news_grid');

$NEWS_TEMPLATE['default'] = $grid_templates['col-md-4'];

It works nicely.

But when I tried to do it opposite way (put code in news template).

$NEWS_TEMPLATE['default'] - normal code

and in grid news template:
$news_templates = e107::getTemplate('news', 'news');
$NEWS_GRID_TEMPLATE['col-md-4'] = $news_templates['default'];

I am getting error

Couldn't find template/layout with the following params:
Array
(
    [lastname_74758209201093747] => 
    [caption] => 
    [category] => 
    [source] => latest
    [layout] => col-md-04
    [count] => 4
    [feature] => 0
    [titleLimit] => 0
    [summaryLimit] => 0
    [tmpl] => news_grid
    [tmpl_key] => col-md-04
    [mode] => news_grid_menu
    [order] => n.news_datestamp DESC
    [return] => 1
)

but when I print value of $NEWS_GRID_TEMPLATE in template file, it is correct.

Why this is not working for menu?