Mail Cleanup Job fails with Postgres error

Expected behavior

No errors in the logs.

Actual behavior

I deleted a rather large mail account. The next day I found the following in the logs:

Doctrine\DBAL\Query\QueryException: The number of parameters must not exceed 65535. Restriction by PostgreSQL.
/var/www/vhosts/xyz/abc/apps/mail/lib/Db/MessageMapper.php - line 1135:
OC\DB\QueryBuilder\QueryBuilder->execute()
/var/www/vhosts/xyz/abc/apps/mail/lib/Service/CleanupService.php - line 66:
OCA\Mail\Db\MessageMapper->deleteOrphans()
/var/www/vhosts/xyz/abc/apps/mail/lib/BackgroundJob/CleanupJob.php - line 46:
OCA\Mail\Service\CleanupService->cleanUp()
/var/www/vhosts/xyz/abc/lib/public/BackgroundJob/Job.php - line 80:
OCA\Mail\BackgroundJob\CleanupJob->run()
/var/www/vhosts/xyz/abc/lib/public/BackgroundJob/TimedJob.php - line 61:
OCP\BackgroundJob\Job->execute()
/var/www/vhosts/xyz/abc/cron.php - line 128:
OCP\BackgroundJob\TimedJob->execute()

Mail app

Mail app version: 1.10.5

Mailserver or service: self-hosted (Postfix/Dovecot)

Server configuration

Operating system: Ubuntu 18.04.6 LTS

Web server: Apache 2.4.29-1ubuntu4.14

Database: MySQL 1:10.1.48-0ubuntu0.18.04.1

PHP version: 7.4

Nextcloud Version: 21.0.0

Client configuration

Browser: Firefox 94.0.1

Operating system: Ubuntu 21.10

Start at apps/mail/lib/Db/MessageMapper.php line 1135, then trace the cleanup flow through CleanupService.php line 66 and CleanupJob.php line 46. Reproduce cleanup after deleting a large mail account and verify that the job completes without PostgreSQL's parameter-limit error.