Correct setting custom state on page load

There is a certain database of records on server (mything) and I want to use its filtered copy in the page interface by setting the custom state (set custom state as list of mything) on ​​the event “when page is loaded”.

As a result, in repeating groups, the user does not change the database on the server, but its copy on the page. And only further, if necessary, by pressing a button, the user makes changes to the database on the server.

Question: how in this case setting of a custom state and its displaying in RG are synchronize?
Can it happened that some of the records of the RG wiil be “lost”?
Or will the RG start displaying the list only after the custom state is fully loaded from the database?

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