Meteor Mongo and network break

If I understood correctly the mode of operation of mongodb with Meteor, when updating the database (insert, update, delete …) it is the local base ‘minimongo’ which is modified. Mongo (or meteor, I do not know) will then synchronize the local base Minimongo and the base present on the server.
The question is :
What happens if there is a network break between the update of minimogo and the syynchronization of minimongo with the base of the server ??
What is your opinion, or did you know there is a document dealing with this problem.
All this to know how to handle errors in meteor.

Thank you for your answers.