In [this](https://github.com/twentyhq/twenty/pull/7522) and
[this](https://github.com/twentyhq/twenty/pull/7543) PR we introduced
the impossibility to save a field that would be non nullable but without
a default value.
The check is actually called on the input while the defaultValue is
added by the service on a "built" fieldMetadata to create or save. So
far all fields created from the app it currently fails as both
isNullable and defaultValue are undefined so falsy at that stage.