Write a reply in email thread that has multiple replys, turn phone in landscape mode and all you wrote disappears or K9 crasches

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

20.1

Where did you get the app from?

F-Droid

Android version

Android 16

Device model

Samsung Galaxy Flip 6

Steps to reproduce

1. Press reply to email
2. Start writing
3. If you now turn the phone to landscape mode all you wrote disappears and you are back to the original email
4. It's also possible that K9 crashes or asks you to clear the app cache
5. It happens only when there are multiple replys in the email, like when you email to a support get an answer, reply to it get an answer reply again....

Expected behavior

When turning phone to landscape mode, I thought I could continue to write my message and when turning back to horizontal, same thing.

Actual behavior

This bug has been present I K9 mail as long I remember. It's not affected when normally replying to a email, but when you continue the email thread.
Fot example, I had to contact a product support, wrote a email and sended it. Got a reply, and replyed back by pressing the reply button, wrote my message and sended it. Got again a reply to that message, pressed the reply button and wrote my message. Now before sending the email, I turned the phone to landscape mode and back up horizontal. All I wrote disappeared, and I was back in the original message.
This is easy to reproduce, it happens every time.
Notice, replying to the first incoming email does not do that behavior. I'm not sure if if it needs be a replay to a replay or more, but it's a bug. When you have written a long reply and mistakenly turn your phone to landscape mode, everything disappears and can not be find anywhere

Logs

No response

The issue names no source file or test. Start by reproducing landscape rotation while replying to a multi-reply thread on Thunderbird for Android 20.1, then trace the reply composer’s state restoration; done means the draft remains intact and the app does not crash.