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                        [Persons] Setting the birthdate on a person's page leads to an endless loading
Bug Description
Making changes on a person page and clicking 'Save' leads to an endless loading. No error is displayed in the server logs or in the UI.
Steps to Reproduce
- Open a person and set the 'Date of birth';
- Click 'Save'.
Actual Behavior
The UI displays an endless loading screen. No error is displayed in the UI or in the server logs. After stopping and restarting the server, it is visible that the changes made on the person page were not saved.
Expected Behavior
The changes made on the person page should be saved and no endless loading should happen.
Screenshots
GIF of the steps and the behavior:

System Details
- Device: Windows 10
- SORMAS version: 1.76.0-SNAPSHOT(90f6723)
- Android version/Browser: Chrome
- Server URL: local machine
- User Role: Admin+National User
Additional Information
The behavior could not be reproduced on any testing instance (on current or older versions of SORMAS) but it was reproducible for @roxanamlendea on her local machine as well.