NextcloudPi Panel shows "PHP service down" after Update from 7.4 to 8.0 but it isn't down

Nextcloud version (eg, 20.0.5): 23.0.4.1
Operating system and version (eg, Ubuntu 20.04): Debian GNU/Linux 11. 5.15.32-v8+ (aarch64)
Apache or nginx version (eg, Apache 2.4.25): Server version: Apache/2.4.53 (Debian) Server built: 2022-03-14T16:28:35
PHP version (eg, 7.4): PHP 8.0.18 (cli) (built: Apr 21 2022 10:49:51) ( NTS ) Copyright (c) The PHP Group Zend Engine v4.0.18, Copyright (c) Zend Technologies with Zend OPcache v8.0.18, Copyright (c), by Zend Technologies

The issue you are facing:
I set up a fresh NC instance on raspbian 64bit version.
After setting up the external apt-packages for PHP and “apt upgrade” version 8.1 was installed and activated automatically.
After downgrading the PHP service from 8.1 to 8.0 I faced some issues: The NC service was down due to an internal error. After purging version 7.4 and 8.1 and rebooting the system NC worked again.
However, NCPi panel shows me the PHP service was down and when logging in via browser I get error messages “unable to load weather… etc.”. But everything seems to work how it should. No errors in NC check.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. See description.

The output of your Nextcloud log in Admin > Logging:

PASTE HERE

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

  <?php
$CONFIG = array (
  'passwordsalt' => 'REMOVED',
  'secret' => 'REMOVED',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    7 => 'nextcloudpi',
    5 => 'nextcloudpi.local',
    8 => 'nextcloudpi.lan',
    3 => 'nextcloudpi',
    11 => 'REMOVED',
    1 => 'REMOVED',
    14 => 'nextcloudpi',
    20 => 'REMOVED',
    21 => 'REMOVED',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '23.0.4.1',
  'overwrite.cli.url' => 'https://nextcloudpi/',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'ncadmin',
  'dbpassword' => 'REMOVED',
  'installed' => true,
  'instanceid' => 'oc8sohrss13t',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,

The output of your Apache/nginx/system log in /var/log/____:

[Sat May 21 00:00:35.131832 2022] [ssl:warn] [pid 26590] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Sat May 21 00:00:35.132058 2022] [ssl:error] [pid 26590] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subject: CN=raspberrypi / issuer: C>
[Sat May 21 00:00:35.132078 2022] [ssl:error] [pid 26590] AH02604: Unable to configure certificate localhost:4443:0 for stapling
[Sat May 21 00:00:35.132148 2022] [http2:warn] [pid 26590] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are pr>
[Sat May 21 00:00:35.279632 2022] [mpm_prefork:notice] [pid 26590] AH00163: Apache/2.4.53 (Debian) mod_fcgid/2.3.9 OpenSSL/1.1.1n configured -- resuming normal op>
[Sat May 21 00:00:35.279711 2022] [core:notice] [pid 26590] AH00094: Command line: '/usr/sbin/apache2'
No site matches ncp-activation (disabled by site administrator)

Logging at warning level to file: /tmp/coolwsd.ZzLQmFwb2D/coolwsd.log
Security: coolforkit incorrect user-name, other than 'cool'
Init vcl
preload: merged ucpchelp1 msforms vbaobj pcr vbaswobj sw animcore hwp chartcore solver sc wpftcalc ucpcmis1 wpftdraw sd svgfilter graphicfilter wpftimpress sdfilt>
Disabled: ucpftp1 rptxml dbu rptui rpt mork odbc sdbc2 cmdmail PresenterScreen abp dbp
Allowlisted languages: de_DE el en_GB en_US es_ES fr_FR hu it nl pt_BR pt_PT ru
Preloading dictionaries: de_DE en_US fr_FR it_IT nl_NL pt_BR ru_RU en_GB nl_BE pt_PT es_ES
Preloading thesauri: de_DE en_US fr_FR it_IT nl_NL pt_BR ru_RU en_GB nl_BE pt_PT es_ES
Preload icons
Preload languages
Preload fonts
Preload config
Ready to accept connections on port 9983.

Security: coolmount incorrect user-name, other than 'cool'
Aborting.
Security: coolmount incorrect user-name, other than 'cool'
Aborting.
Security: coolmount incorrect user-name, other than 'cool'
Aborting.
No site matches ncp-activation (disabled by site administrator)

Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.

https://pastebin.com/nzFfCX3Q