Meta Box

So I managed to add the relationship via code and also implemented the changes from the commit.
I can now see all events, present and past. The videos show up in the events, where they are supposed to.
But as soon as I hit "save" on a video, the relationships field jumps back to "select an event"

This is the code for the relationship I used:

add_action( 'mb_relationships_init', function () {
    MB_Relationships_API::register( [
		'id'   => 'video_to_events',
        
		'from' => [
		'object_type' => 'post',
		'post_type'   => 'video',

		'meta_box'    => [
			'title' => 'Event related to Video Neu',
		],

		'field' => [
			'label' => 'Event related to Video Neu',
			],

		'query_args' => [
    			'post_status' => 'any',
			'suppress_filters' => 'true',
		],
		
		],
		
		'to'   => [
		'object_type' => 'post',
		'post_type'   => 'tribe_events',

		'meta_box'    => [
			'title' => 'Videos related to Event Neu',
		],

		'field' => [
			'label' => 'Videos related to Event Neu',
			],
			
		'query_args' => [
    			'post_status' => 'any',
			'suppress_filters' => 'true',

		],

		],
		
    ] );
} );