_Exception: Exception: Could not save product - API V2 - status=400 - errors=null - status_verbose=FormatException: Unexpected character (at character 1)

Sentry Issue: [SMOOTHIE-5M0](https://openfoodfacts.sentry.io/issues/6251333241/?referrer=github_integration)

```
_Exception: Exception: Could not save product - API V2 - status=400 - errors=null - status_verbose=FormatException: Unexpected character (at character 1)
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
^
```