diff --git src/wp-admin/includes/ajax-actions.php src/wp-admin/includes/ajax-actions.php
index 9751bc5..e099f33 100644
--- src/wp-admin/includes/ajax-actions.php
+++ src/wp-admin/includes/ajax-actions.php
@@ -3822,15 +3822,15 @@ function wp_ajax_search_plugins() {
  * Ajax handler for searching plugins to install.
  *
  * @since 4.6.0
- *
- * @global WP_List_Table $wp_list_table Current list table instance.
- * @global string        $hook_suffix   Current admin page.
  */
 function wp_ajax_search_install_plugins() {
 	check_ajax_referer( 'updates' );
 
-	global $wp_list_table, $hook_suffix;
-	$hook_suffix = 'plugin-install.php';
+	$pagenow = sanitize_text_field( wp_unslash( $_POST['pagenow'] ) );
+
+	if ( $pagenow === 'plugin-install-network' || $pagenow === 'plugin-install' ) {
+		set_current_screen( $pagenow );
+	}
 
 	/** @var WP_Plugin_Install_List_Table $wp_list_table */
 	$wp_list_table = _get_list_table( 'WP_Plugin_Install_List_Table' );
diff --git src/wp-admin/js/updates.js src/wp-admin/js/updates.js
index 24a8186..9951e26 100644
--- src/wp-admin/js/updates.js
+++ src/wp-admin/js/updates.js
@@ -1987,7 +1987,8 @@
 					_ajax_nonce: wp.updates.ajaxNonce,
 					s:           $( '<p />' ).html( $( this ).val() ).text(),
 					tab:         'search',
-					type:        $( '#typeselector' ).val()
+					type:        $( '#typeselector' ).val(),
+					pagenow:     pagenow
 				}, { type: 'term' } );
 
 			if ( wp.updates.searchTerm === data.s ) {