IMAP messages retrieved out-of-order

I used another IMAP client (Thunderbird, fwiw) to copy messages into my inbox from another account. To the extent I can verify, none of the date/time metadata changed on those messages but K-9 Mail retrieved these old copied messages as if they were the newest messages.

Before I copied those messages, my K-9 Mail inbox was correctly populated with at least several dozen recent emails. After the copy, it only contained old copied messages and messages which arrived after I performed the copy. Hitting Load up to 25 more loaded 25 more old messages, not the 25 most recent inbox messages.

I tried using 'Clear local messages' on the Inbox folder but the old-message-first behavior remained.

The only solution I found was to keep loading messages until all the old copied ones were present in my K-9 Mail inbox. That's obviously a poor solution since it means I have to haul around hundreds of old emails.

Environment

K-9 Mail version: 5.010

Android version: 6.0.1

Account type: Exchange via IMAP

No source file or test is named in the report. Reproduce the Exchange-via-IMAP Inbox behavior described with copied older messages, including Load up to 25 more and Clear local messages, then trace the message retrieval entry point; done means recent messages appear before older copied messages without loading the entire history.