Index: src/wp-admin/includes/class-wp-site-health.php
===================================================================
--- src/wp-admin/includes/class-wp-site-health.php	(revision de5d82fe52a3a05ee43742cdd4bfbb91d2a9903a)
+++ src/wp-admin/includes/class-wp-site-health.php	(date 1581373582898)
@@ -18,6 +18,8 @@
 	private $health_check_mysql_required_version = '5.5';
 	private $health_check_mysql_rec_version      = '';
 
+	public $php_memory_limit;
+
 	public $schedules;
 	public $crons;
 	public $last_missed_cron     = null;
@@ -33,6 +35,9 @@
 	public function __construct() {
 		$this->maybe_create_scheduled_event();
 
+		// Save memory limit before it's affected by wp_raise_memory_limit( 'admin' ).
+		$this->php_memory_limit = ini_get( 'memory_limit' );
+
 		$this->timeout_late_cron   = 0;
 		$this->timeout_missed_cron = - 5 * MINUTE_IN_SECONDS;
 
Index: src/wp-admin/includes/class-wp-debug-data.php
===================================================================
--- src/wp-admin/includes/class-wp-debug-data.php	(revision de5d82fe52a3a05ee43742cdd4bfbb91d2a9903a)
+++ src/wp-admin/includes/class-wp-debug-data.php	(date 1581373737074)
@@ -648,6 +648,14 @@
 				'label' => __( 'PHP memory limit' ),
 				'value' => ini_get( 'memory_limit' ),
 			);
+
+			if ( WP_Site_Health::get_instance()->php_memory_limit !== ini_get( 'memory_limit' ) ) {
+				$info['wp-server']['fields']['admin_memory_limit']        = array(
+					'label' => __( 'PHP memory limit (only for admin screens)' ),
+					'value' => WP_Site_Health::get_instance()->php_memory_limit,
+				);
+			}
+
 			$info['wp-server']['fields']['max_input_time']      = array(
 				'label' => __( 'Max input time' ),
 				'value' => ini_get( 'max_input_time' ),