Just to check: when you install the beta you are not uninstalling the previous version first? That would remove all the settings on both the watch and the iPhone.
Also, did you lose the screens etc from the iPhone app? If you did then the problem is the loss of all data from the iPhone app. When you say that you imported the screens do you mean from the phone to the watch, or from a backup into the phone?
If you didn't lose the screens from the iPhone app then this sounds the same as
@Miggui, who is having two separate problems that may be related: the loss of the watch app settings; and the inability to send them from the iPhone app.
Is anyone else losing settings whenever they install the beta, and then being unable to send them again from the iPhone?
I probably need to improve the backup procedure in the future, but it is too late for this version, which will hopefully be released soon.