diff -urN ../z-push-2.6.2+0.orig/src/backend/combined/config.php ./src/backend/combined/config.php
--- ../z-push-2.6.2+0.orig/src/backend/combined/config.php	2021-02-04 03:38:38.000000000 +0200
+++ ./src/backend/combined/config.php	2022-01-30 11:41:45.884342000 +0200
@@ -77,7 +77,7 @@
                 SYNC_FOLDER_TYPE_OUTBOX => 'i',
                 SYNC_FOLDER_TYPE_TASK => 'z',
                 SYNC_FOLDER_TYPE_APPOINTMENT => 'z',
-                SYNC_FOLDER_TYPE_CONTACT => 'z',
+                SYNC_FOLDER_TYPE_CONTACT => 'd',
                 SYNC_FOLDER_TYPE_NOTE => 'z',
                 SYNC_FOLDER_TYPE_JOURNAL => 'z',
                 SYNC_FOLDER_TYPE_OTHER => 'i',