After D14246 this scenario is possible (this is caused because the effect is asynchronous):

1. This effect is executed when Tunnelbroker is disconnected, getCurrentIdentityUserState is called
2. In this time, Tunnelbroker connects, but when the effect is running again we early-exit because backupUploadInProgress.current = true
3. The call to getCurrentIdentityUserState is done, we need a migration but in this execution, Tunnelbroker is disconnected so we early-exit
4. Migration is not performed.

In this case, we might call getCurrentIdentityUserState in parallel but we not facing the issue described above.

Depends on D14246

Tested migration multiple times, race condition is not occuring anymore