No message in all folders using iCloud account

[hexadec]

Steps to reproduce

1. Add an icloud account with an app-specific password
2. Try to download messages in any folder

Expected behavior

App should show the messages present on the server

Actual behavior

App not showing any messages on the server, not even those that were sent through Nextcloud Mail (as sending works properly). Bug seems to match the one described here: https://help.nextcloud.com/t/no-message-in-this-folder/81030

Mail app version

3.5.5

Mailserver or service

iCloud

Operating system

Ubuntu 22.04, Linux 5.15.0-1044-raspi aarch64

PHP engine version

PHP 8.1

Web server

Apache (supported)

Database

MySQL

Additional info

No response