Sync to iOS shows company instead of person name

Describe the bug

When creating a contact on NextCloud in the browser, it is synced to my iPhone, showing the company field as the contact's name. The contact's name is not visible in iOS at all, so basically the contact's name is replaced with the company field (see example "Bert Böller" below.
Contacts with empty company field also sync correctly to iOS.
And the other way around also works fine: Creating a contact on iOS including a company name will be synced to NextCloud without problems (example "Anton Aberwitz").

Steps to reproduce

1. Setup contact sync with your iPhone according to the description here: https://docs.nextcloud.com/server/19/benutzerhandbuch/pim/sync_ios.html
2. Create a contact in NextCloud, using the browser. Include a company name as in example "Bert Böller".

4. Drag down the screen on your iPhone to updated contacts.

5. See the result.
   
   

6. Create a contact on iOS, including a company name, just like this:
   

7. Sync and see the result on NextCloud in the browser: It's fine. Please note that there is a "Detailed name" section which is not visible with the contact created on NextCloud.

Expected behavior

The contact's person name should show up in contacts on iOS.
As a workaround: The contact's "Details name" section should be visible in NextCloud, so the user can decide how the person name will be synced.

Actual behavior

The contact's company field shows up as the person name in iOS. The person name is not synced at all.
The contact's "Detail name" section is not visible on NextCloud.

Contact version

5.3.2

Operating system

Linux 5.4.0-156-generic x86_64

PHP engine version

Other

Web server

Nginx

Database

MySQL

Additional info

PHP version is 8.2.8.
We are using a NextCloud installation provided by IONOS. According to a lookup at sitereport.netcraft.com they use Nginx as webserver.
MySQL version is 10.5.19

No source file or test entry point is named in the report. Start by reproducing the browser-created contact and comparing its person and company fields during iOS sync with a contact created on iOS; done means the person's name appears on iOS while the company name remains separate.