distinct_id becomes null after upgrading from v3.0.5 to v3.0.9

[enu-kuro]

After upgrading mixpanel-react-native from v3.0.5 to v3.0.9, all events started showing distinct_id: null ("<nil>" in Mixpanel).

This seems to match the issue described in this pull request:
#273

[enu-kuro]

I have a question regarding the implementation of initializationCompletePromise() in MixpanelPersistent.

Currently, the method is defined as:

  async initializationCompletePromise(token) {
    Promise.all([
      this.loadIdentity(token),
      this.loadSuperProperties(token),
      this.loadTimeEvents(token),
      this.loadOptOut(token),
      this.loadAppHasOpenedBefore(token),
    ]);
  }

It seems that the Promise.all() result is not returned, meaning that the initialize() method might proceed before identity and other states are fully loaded.

Shouldn't it be written as:

  async initializationCompletePromise(token) {
    return Promise.all([
      this.loadIdentity(token),
      this.loadSuperProperties(token),
      this.loadTimeEvents(token),
      this.loadOptOut(token),
      this.loadAppHasOpenedBefore(token),
    ]);
  }

This would ensure that the asynchronous loading completes before other methods rely on the identity state.