Unread Smartbox goes back to smartbox instead of next email when deleting

What happened?
When I am using the unread smartbox I set up it seems to be navigating back to the smartbox “inbox” view when I delete an emaiil rather than moving on to the email like the other Smartboxes.

What did you expect to happen?
Move on to the next email.

Steps to reproduce
Open unread smartbox > delete email

What mail provider(s) are you using?
iCould x1 and Gmail x2

What version of iOS?

What build number of Big Mail?
(You can find this in TestFlight)
2.0 (53)