I have foud another bug since https://premium.wpmudev.org/forums/topic/old-appointments-reserved-from-gcal-are-moved-to-removed-appointments-and-dissapear-from-gcal#post-1081819!
I am not sure if it is related to this file or it came with the last update.
I have two service providers, me and another one, I am the admin.
When I block a appointment in my own agenda, it remove the availabilities as well in my other service provider in appointments+.
Its not so bad at the moment because we dont work at the same time, but it will be a real problem soon..