K9 looses settings to OpenKeyChain

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 version

6.202

Where did you get the app from?

Google Play

Android version

12

Device model

Galaxy A52S 5G

Steps to reproduce

1. Create new mail with some text
2. Try to send
3. Error message appears: no connection to OpenKeyChain.
4. Can't save the mail, only exit without saving is possible.
5. Check settings for my mailaccount end-to-end key, no key defined.
6. Select a key from OpenKeyChain and it works for one mail only. Then forgets the key again.
7. I am on the latest version / updates of Android 12, have no special settings and no Antivirus app.

Expected behavior

Send the encrypted mail as it does months before.

Actual behavior

Error message, does not send the mail

Logs

Start by reproducing the failure on Android 12 with K-9 Mail 6.202 and OpenKeyChain, following the listed send and key-selection steps. Trace why the selected end-to-end key is forgotten after one mail; done means the key persists in the account settings and encrypted mail sends successfully.