@RomanZ tried your settings.dat with 1.4.106, hybernate still does not work. Temporary solution I have for me now - cronjob to start btsync at night for 1h to sync files, and after 1 h stop btsync service. Can you clarify with devteam by when they plan to fix it? If you need any help from me - just tell.
Latest 1.4.99 still showing the problem with hibernation on synology DS413, let me know, if any debug informaion is required to help you fix the problem. Adding "config_refresh_interval" : 43200, "folder_rescan_interval" : 43200, to the sync.conf does not help.