Fehlende Details bei API Fehler

Ich habe immer wieder Probleme mit VARIO, wenn Daten per API an Gambio gehen.
Allerdings sieht man in VARIO auch im Debug-Modus nicht genug:

Code:

24.10.2023 23:07:41 [TGambioAPI] POST  https://... .../api.php/v3/products/158/variants

[HEADER]: Authorization=Basic dG9yb0Br... ...Mg==
[HEADER]: Content-Type=application/json

CONTENT:
[
    {
        "sortOrder": 460300,
        "modelNumber": "27305-XL-N200R",
        "GTIN": "",
        "ASIN": "",
        "EAN": "",
        "stockType": "only-positive",
        "stock": 100,
        "weightType": "replacing",
        "weight": 0,
        "priceType": "replacing",
        "price": 0,
        "vpeScalarValue": 0,
        "vpeUnitId": null,
        "deliveryTimeId": 1,
        "imageListId": null
    }
]

24.10.2023 23:07:41 [TGambioAPI] STATUS:
    500 Internal Server Error

HEADER:
    Cache-Control: public, max-age=0
    Connection: Keep-Alive
    Date: Tue, 24 Oct 2023 21:07:41 GMT
    Keep-Alive: timeout=5, max=100
    Content-Length: 54
    Content-Type: application/json; charset=UTF-8
    Expires: Tue, 24 Oct 2023 21:07:41 GMT
    x-rate-limit-limit: 5000
    x-rate-limit-remaining: 4877
    x-rate-limit-reset: 1698182536
    x-shop-version: v4.8.0.2
    x-api-version: 3.0.0
    x-content-type-options: nosniff

CONTENT:
{
    "error": "An unexpected error occurred.",
    "details": ""
}

Das "details"- Attribut in der Antwort ist immer leer.
Sollte da nicht jeweils etwas drin stehen? In /logfiles/api.log.txt (resp. .json) findet man ja deutlich mehr:

Code:

4052 ######################################################################
4053
4054 [2023-10-24 23:07:41 | ERROR] An unexpected error occurred while handling an incoming request.
4055 context:
4056   error:
4057     class: TypeError
4058     message: Argument 1 passed to Gambio\Api\Modules\ProductVariant\App\ProductVariantApiRequestValidator::validateGenerationBody() must be of the type arr     ay, null given, called in /.../GambioApi/Modules/ProductVariant/App/ProductVariantApiRequestValidator.php on line 49
4059     code: 0
4060     file: /.../GambioApi/Modules/ProductVariant/App/ProductVariantApiRequestValidator.php:107
4061     trace:
4062       0: /.../GambioApi/Modules/ProductVariant/App/ProductVariantApiRequestValidator.php:49
4063       1: /.../GambioApi/Modules/ProductVariant/App/Actions/CreateProductVariantsAction.php:98
4064       2: /.../vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php:38
4065       3: /.../vendor/slim/slim/Slim/Routing/Route.php:358
4066       4: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:65
4067       5: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:65
4068       6: /.../vendor/slim/slim/Slim/Routing/Route.php:315
4069       7: /.../vendor/slim/slim/Slim/Routing/RouteRunner.php:68
4070       8: /.../vendor/slim/slim/Slim/Middleware/RoutingMiddleware.php:45
4071       9: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:121
4072       10: /.../vendor/slim/slim/Slim/Middleware/ErrorMiddleware.php:76
4073       11: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:121
4074       12: /.../GambioApi/Application/Middleware/RateLimitMiddleware.php:85
4075       13: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:168
4076       14: /.../GambioApi/Application/Middleware/AuthenticationMiddleware.php:78
4077       15: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:168
4078       16: /.../GambioApi/Application/Middleware/VersionsMiddleware.php:38
4079       17: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:168
4080       18: /.../vendor/slim/slim/Slim/MiddlewareDispatcher.php:65
4081       19: /.../vendor/slim/slim/Slim/App.php:199
4082       20: /.../vendor/slim/slim/Slim/App.php:183
4083       21: /.../GambioCore/Application/Kernel/HttpKernel.php:67
4084       22: /.../GambioCore/Application/Application.php:70
4085       23: /.../api_v3.php:24
4086       24: /.../api.php:13
4087 extra:
4088   request:
4089     method: POST
4090     uri: /.../api.php/v3/products/158/variants
4091     software: LiteSpeed
4092     address: 149.... ...9
4093     userAgent: Embarcadero RESTClient/1.0
4094     time: 101
4095     remoteAddress: cdb9e934e038ca93c6c46f4076e1fbbb
4096

Warum wird in den API-Antworten ein leeres Attribut ausgegeben?
Ist das Absicht oder Fehler? Die Ausgabe des leeren Attributs "details" deutet auf letzteres...


UND:
Gemäss der API Dokumentation müsste das doch einen 400 Error geben, nicht 500, oder?