Is there any way to prevent this behavior? I know the emails are still in the individual account inbox(es) and changing their status back to unread puts them back in the Unified Inbox, but that is kind of tedious.
I see that there is a K-9 Unread Email Widget that may or may not be affecting this behavior, but I cannot find any reference to widgets in the app.
Do you perhaps have Sort set to “Read/Unread”? That can make it look
like read messages have disappeared.
Try setting Sort to “Date”.
Read messages don’t disappear from Unified, for me, with Sort set to “Date”.
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Yep, that was it. I never changed the sort from the default and thought it was by date.