File Link fields do not save values

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

{
"system": {
"instanceid": "REMOVED SENSITIVE VALUE",
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"cloud.skiclub-bad-schoenborn.de"
],
"datadirectory": "REMOVED SENSITIVE VALUE",
"dbtype": "mysql",
"version": "34.0.2.1",
"overwrite.cli.url": "https://cloud.skiclub-bad-schoenborn.de",
"dbname": "REMOVED SENSITIVE VALUE",
"dbhost": "REMOVED SENSITIVE VALUE",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"installed": true,
"twofactor_enforced": "true",
"twofactor_enforced_groups": [],
"twofactor_enforced_excluded_groups": [],
"default_phone_region": "DE",
"maintenance_window_start": 1,
"mail_smtppassword": "REMOVED SENSITIVE VALUE",
"mail_smtpname": "REMOVED SENSITIVE VALUE",
"mail_domain": "REMOVED SENSITIVE VALUE",
"mail_from_address": "REMOVED SENSITIVE VALUE",
"mail_smtpmode": "smtp",
"mail_smtphost": "REMOVED SENSITIVE VALUE",
"mail_smtpauth": true,
"mail_sendmailmode": "smtp",
"mail_smtpstreamoptions": {
"ssl": {
"allow_self_signed": false,
"verify_peer": true,
"verify_peer_name": true
}
},
"app_install_overwrite": [],
"serverid": "allinkl-webspace-1",
"loglevel": 2,
"tempdirectory": "/www/htdocs/w00f4fc6/cloud.skiclub-bad-schoenborn.de/data/tmp",
"maintenance": false
}
}

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Insert your browser log here, this could for example include:
a) The javascript console log
b) The network log
c) ...

a) Browser console log: those messages appear before the metavox fields will be touched. the appear when opening the context menu of the file and open the detail view of the file.

[Violation] 'requestAnimationFrame' handler took 65ms
[Violation] Forced reflow while executing JavaScript took 65ms
core-common.js?v=b5bf7e84-0:1 [Violation] 'setTimeout' handler took 74ms
[Violation] Forced reflow while executing JavaScript took 74ms
/index.php/apps/files/files/214?dir=/Vorstandschaft/Test%20Bilder&opendetails=true:1 Blocked aria-hidden on an element because its descendant retained focus. The focus must not be hidden from assistive technology users. Avoid using aria-hidden on a focused element or its ancestor. Consider using the inert attribute instead, which will also prevent focus. For more details, see the aria-hidden section of the WAI-ARIA specification at https://w3c.github.io/aria/#aria-hidden.
Element with focus: <button.action-button button-vue focusable>
Ancestor with aria-hidden: <div.v-popper__popper v-popper--theme-nc-popover-8 _ncPopover_HuRfU action-item__popper v-popper__popper--hidden v-popper__popper--hide-from#popper_4kzvt38c_abn5j9> <div id=​"popper_4kzvt38c_abn5j9" aria-hidden=​"true" tabindex=​"0" data-popper-placement=​"bottom" class=​"v-popper__popper v-popper--theme-nc-popover-8 _ncPopover_HuRfU action-item__popper v-popper__popper--hidden v-popper__popper--hide-to" style=​"position:​ absolute;​ transform:​ translate3d(191px, 324px, 0px)​;​">​…​</div>​

</details>