Sending files in IMAP vanished in Em Client

Recently I purchased Em Client instead of using Outlook, but are close to regret this.
Today I had to find an important email sent on November 19, but whatever I did, I couldn’t find it in Em Client.
Did instead a web login on the email server, and there it was in the send box as it should be.
Rather angry about this, and have no intention to discuss this, but only conclude Em Client is in no way as good as I have expected.
If this is an error in version 9.2.1222, I have no problem installing an older version, however I am not going into a discussion of this extreme failure in this forum!

Right click the “Sent” folder and choose Properties.
Select Repair in the Repair tab to reload the sent folder.
This fixes the missing mail.