When using web-updater or commandline-updater a new update (21.0.3) is found. But the process ends with "Nextcloud is already latest version" and stays at current 21.0.2.

System:

www-data@home:~/home/updater$ uname -a
Linux home 5.10.0-0.bpo.5-amd64 nextcloud/server#1 SMP Debian 5.10.24-1~bpo10+1 (2021-03-29) x86_64 GNU/Linux

www-data@home:~/home/updater$ php -v
PHP 7.3.27-1~deb10u1 (cli) (built: Feb 13 2021 16:31:40) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.27, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.3.27-1~deb10u1, Copyright (c) 1999-2018, by Zend Technologies

Updater-Output
www-data@home:~/home/updater$ php updater.phar
Nextcloud Updater - version: v20.0.0beta4-11-g68fa0d4

Current version is 21.0.2.

Update to Nextcloud 21.0.3 available. (channel: "stable")
Following file will be downloaded automatically: https://download.nextcloud.com/server/releases/nextcloud-21.0.3.zip
Open changelog ↗

Steps that will be executed:
[✔] Check for expected files
[✔] Check for write permissions
[✔] Create backup
[✔] Downloading
[✔] Verify integrity
[✔] Extracting
[✔] Enable maintenance mode
[✔] Replace entry points
[✔] Delete old files
[✔] Move new files in place
[✔] Done

Continue update? [y/N] y

Info: Pressing Ctrl-C will finish the currently running step and then stops the updater.

[✔] Check for expected files
[✔] Check for write permissions
[✔] Create backup
[✔] Downloading
[✔] Verify integrity
[✔] Extracting
[✔] Enable maintenance mode
[✔] Replace entry points
[✔] Delete old files
[✔] Move new files in place
[✔] Done

Update of code successful.

Should the "occ upgrade" command be executed? [Y/n]
Nextcloud is already latest version

Keep maintenance mode active? [y/N]
Maintenance mode already disabled

Maintenance mode is disabled

www-data@home:~/home$ php occ status
  - installed: true
  - version: 21.0.2.1
  - versionstring: 21.0.2
  - edition: