Modifications to contacts fail with error message "The contact you were trying to edit has changed" after the first modification

Describe the bug

If I try to edit a contact's info, I can do so no problem for the first thing. Let's say I want to change the name, and the surname. I can change the name no problem, but then if I want to change the surname, it fails telling me that "The contact you were trying to edit has changed". I need to reload the page, and edit it again. This is really annoying. It's CONSISTENTLY always after the first edit. If I reload, I made the edit I wanted, and want to make another one, then again, it pops up.

I've never not had this bug, it has always happened since I've installed the app.

Steps to reproduce

1. Go to a contact
2. Modify any of its contents
3. Try to modify something else
4. Error

Expected behavior

I should be able to modify as much as I want without problems.

Actual behavior

I can't do more than a single modification per page refresh.

Contact version

4.2.0

Operating system

Arch Linux

PHP engine version

PHP 8.1

Web server

Nginx

Database

MariaDB

Additional info

Here you can see the network logs for this error:

I did two modifications. I added a single character into the address field, which is the 204 request, and then I deleted it, resulting in a 412 request and the error popping up.

Start with the contact edit flow and compare the 204 request from the first change with the following 412 request shown in the network logs. Trace how the contact state is handled between submissions; done means successive edits complete without a page reload and without the 412 error.