The Events Calendar 4.0.4 // Use full size thumbnail in Month View tooltip

example.php

if ( function_exists( 'tribe_is_event') ) {
	/**
	 * Modifying the thumbnail arguments in Month view tooltip from a filter.
	 *
	 * @link https://theeventscalendar.com/support/forums/topic/month-view-tooltip-image-size/
	 * @return array
	 */	
	function change_tribe_json_tooltip_thumbnail( $json ) {
		$event_id = get_the_ID();
	
		if ( ! empty( $json['imageTooltipSrc'] ) ) {
			$thumb_id       = get_post_thumbnail_id( $event_id );       
			$thumbnail_atts = wp_get_attachment_image_src( $thumb_id, 'full' );
	
			$json['imageTooltipSrc'] = $thumbnail_atts[0];
		}
	
		return $json;
	}

	add_filter( 'tribe_events_template_data_array', 'change_tribe_json_tooltip_thumbnail' );
}