Adding a field doesn't "stick" across logins

[jzeevi]

Steps to reproduce

1. Login to 10.4.1 OR 10.5.0 as an admin
2. Switch to contacts
3. select an existing contact
4. select add a field...
5. choose Notes
6. in the notes field that pops up, enter some text
7. logout
8. log back in
9. switch to contacts
10. go to the existing contact from step 3
11. note that there is no Notes field.

Expected behaviour

Notes field should persist across logins

Actual behaviour

Notes field is no longer present.

Server configuration

Operating system: Red Hat 4.8.5-39

Web server:: Apache

Database:: mysql

PHP version:: 7.3

ownCloud version: (see ownCloud admin page) 10.5

Contacts version: (see ownCloud apps page): 1.5.5

Updated from an older ownCloud or fresh install: updated from 10.4.1

Signing status (ownCloud 9.0 and above):: ????

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

List of activated apps:

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

The content of config/config.php:

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

or 

Insert your config.php content here
(Without the database password, passwordsalt and secret)

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:

Operating system:

CardDAV-clients:

Logs

Web server error log

Insert your webserver log here

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...