I just finished a chat with Samsung regarding the ability to have both front and rear cameras operating at the same time for the Note 10 Plus. I was told my concern would be going to the update team and I was given a support ticket so that I would stay notified about the progress but it seemed fairly certain that they would bring this feature back soon in a phone firmware update. I would suggest to anyone that wants this on their particular phone that they contact support and let them know. I will update this thread as I hear of progress.
@userUtK1XjCNJq Thanks keep us updated this is a cool feature too!