I suspect at this point, its working as designed and this would be a feature request that needs to be raised on the Postman Github.
I sort of understand why as it prevents the encrypted info from being discovered through the scripts but as I also use pre-request scripts a lot for authentication, it would mean that I can’t use the vault for this either.
I can use the vault to integrate with Azure Key Vault to retrieve the OAuth information required to authenticate which is a good feature, but I have no way of accessing those details in the pre-request script where I use sendRequest to hit the token end point.
I would have to use the authentication helper or a straight up request in the GUI instead to get the token.
This feature is still quite new, and has had quite a few changes since the first iteration already, so requesting the feature on Github may provide a favourable response as this feature is being actively worked on.