We’re running WP 4.9, Woocommerce 3.2.5, Event Tickets (and Plus) at 4.6.1.1
At some point in the last few upgrades this problem started. We had a couple tickets that literally vanished. We can go into the Event and recreate the ticket – all seems to be fine – until we try to update the Event directly. The browser spins and eventually we get a Connection Lost – Backing up in your browser message. When the event is refreshed the ticket is gone, the product that was associated with it is also gone.
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PLEASE LEAVE FOR SUPPORT
Reporting the same issue as: https://theeventscalendar.com/support/forums/topic/tickets-not-syncing-or-publishing-to-corresponding-event-after-update/