EAS account on Outlook - synchronization stop after receiving calendar invitation

Windows 10, Outlook 2013
Zimbra 8.7.11 with Zextras 2.6.1

After receiving invitation synchronization on INBOX folder stopped to work, after moving this appointment to another folder it started to work on INBOX but stopped on this particular folder.

Before we moved this appointment we restarted Zxmobile, tried to reconfigure or repair account in Outlook (repair didn't help, reconfiguration was not possible due to "can't connect to server" bug - although on other account everything worked during that).

Does anyone else had similar issue?