Updating contact through API deletes stage and owner in mautic

Your software
My Mautic version is: 4.4.1
My PHP version is: 7.4.33
My Database type and version is: 10.7.8-MariaDB-1:10.7.8+maria~ubu1804

Your problem
My problem is:

When updating a contact through api in Mautic data in mautic gets deleted (stage, owner).

This is what we are sending through an after-safe-webhook:

this is what data is updated in mautic:

We used this reference: Mautic Developer Documentation

Seems to be a bug in the API. Can someone validate this or does anyone know a workaround?

These errors are showing in the log:
No errors in log

Steps I have tried to fix the problem:
Set ‘overwriteWithBlank’ => false, [this caused also the lead-score to set to 0]
Set ‘overwriteWithBlank’ => true, [no difference]

You have to add owner and stage in the json parameters too, when sending data to mautic through API, and set both values to 1.