getPeople.set doesn't work sometimes

[MariaTolstov]

We are using the 1.3.5 library in our client app, and we have discovered an issue recently where some of the users are missing properties, after calling mixpanel.identify and then mixpanel.getPeople.set to set the properties. The issue only happens sometimes, on IOS and Android. We suspect that there might be an issue with race condition between the calls, or something of that sort.