XMLRPC _wp_page_template / page_template not working anymore

Hi there,

since many years I′m using the XMLRPC API to create new Posts from my own Dashboard. However, since some weeks the parameter “page_template” which refers to “wp_page_template” in the Doc is not longer working.

Since newPost works with every Parameter that wp_insert_post accepts (function hasn′t been changed since 4.4 as of the changelog) and it is still supported I have no clue whats going on.

I′m using the parameters for newPost like this for many years:

$wp_params = array(
			'post_title' => 'Title',
			'post_content' => '',
			'post_status' => 'draft',
			'page_template' => 'page-product.php',
			'post_date' => date('Y').'-'.date('m').'-'.date('d').' '.date('i').':'.date('i').':'.date('s'),
			'post_name' => 'test',
			'post_parent' => '',
			
		);

Does anyone know what has changed?