Mails do not load since 3.6.1 mailboxlocked error

[Aveyron-RetD]

Steps to reproduce

1.Since 3.6.1 my mails do not load
2.
3.
[INFO] mail: Mailbox 38 (undefined) is locked
Object { app: "mail", uid: "36EB499E-980B-46B4-AA2D-F8CA0CD69914", level: 0, error: MailboxLockedError }

Expected behavior

Mails are displayed..

Actual behavior

Mail app version

3.6.1

Mailserver or service

internal Kerio

Operating system

Nextcloud AIO on docker ubuntu 20.04

PHP engine version

None

Web server

None

Database

None

Additional info

No response

[Aveyron-RetD]

What is weird is new mails do appear on the dashboard...

[ChristophWurst]

Check the nextcloud log for any other errors before the locking started. Locks should be released automatically, but in the case of an error they might get stuck.

[Aveyron-RetD]

Ok problem resolved by an unexpected upgrade to 29.0.1. :-)
not reproducible in 29.0.1