How to reproduce:
Go to folder "drafts" and open any draft except the first or last one. Try to change to previous or next draft without exiting the email.

Actual Outcome:
when draft is open (and not the first or last one) there is no button "previous", "answer" or "next" (see screenshot). This is only available for the first and last draft in the list.

Expected Outcome:
for every draft there should be the buttons "previous", "answer" and "next" when opening the drafts.