RealmSwift wait(for: .upload) not working

MongoDB Atlas App Services & Realm Atlas Device Sync
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Hello, I’m trying to access new synced data in an Atlas function and there’s an issue:

  • I’m creating some objects using RealmSwift on iOS
  • I immediately call try await realm.syncSession?.wait(for: .upload) from a @MainActor async function
  • next, I’m calling an Atlas function that takes the new object _id and queries the db collection to get the full object
  • sometimes the findOne call returns null, but if I retry after a few seconds it works

I tracked the time it takes for the wait(for:) function to run and it takes a few seconds, but still when I create multiple objects at once (single write transaction) and I call the atlas function (a single call), there are always a few objects that haven’t synced and findOne returns null.

Is there anything else I need to do be able to access the data from the function? Should I do an equivalent wait(for: .download) there too?

Sometimes the object was found but another referenced object wasn’t.