post type with select_advanced broken in latest version - works in previous one

In version 5.6.5, the following no longer works. I get the error "The results could not be loaded." I then installed previous version and it works.

[
	'name'        => 'Select a coming soon page',
	'id'          => 'coming_soon_page',
	'type'        => 'post',
	'post_type'   => 'page',
	'tab'		  => 'soon',
	'field_type'  => 'select_advanced',
	'placeholder' => 'Select a page',
	'query_args'  => [
		'post_status'    => 'publish',
		'posts_per_page' => - 1,
	],
],