Steps to reproduce:

1. Enter the Back Office of Ibexa v3.3.1.
2 Change Back Office language to e.g. French after installing a corresponding package:
composer require ezplatform-i18n/ezplatform-i18n-fr_fr
3. Add ezfloat field to Article ContentType.
4. Create content of Article CT, add value "3.5" or "3,5" in ezfloat field and publish.
5. Edit the newly created article.

Result:
ezfloat field is empty. Another publishing of the content object results in an empty value persisted in the database.