Complaints about "Sent folder not found" on every send

[a-name-not-taken]

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

Thunderbird for Android

App version

15.0

Where did you get the app from?

Google Play

Android version

10

Device model

Samsung SM-G960U1

Steps to reproduce

Any send or reply in Version 15.0

Expected behavior

The message is sent. If a sent folder is specified, it is copied there. If not, it is simply sent to the To, Cc, and Bcc addresses on the message.

I do not happen to use a sent folder. I Bcc myself. My "sent folder" is explicitly set to "None" and "Upload sent messages to Sent folder" is off.

Actual behavior

An error message pops up.

Discussed at https://forum.k9mail.app/t/sent-folder-not-found/13995

Logs

No response