Data API page with array of guids parameter

Branche 2025.2.

I have an api Data Page. Input parameter is a list of guid. The database output is put into transformation and an output is sent to response.

In this case it causes an error.

{
    "ClassName": "System.Exception",
    "Message": "Array cannot be converted to string.",
    "Data": {
        "logged": true
    },
    "InnerException": {
        "ClassName": "System.ArgumentException",
        "Message": "Array cannot be converted to string.",
        "Data": null,
        "InnerException": null,
        "HelpURL": null,
        "StackTraceString": "   at Origam.XmlTools.ConvertToString(Object val) in M:\\gitave\\origam.origam\\backend\\Origam.Common\\XmlTools.cs:line 95\r\n   at Origam.Rule.Xslt.MicrosoftXsltEngine.Transform(IXmlContainer data, Object xsltEngine, Hashtable parameters, String transactionId, IDataStructure outputStructure, Boolean validateOnly) in M:\\gitave\\origam.origam\\backend\\Origam.Rule\\Xslt\\MicrosoftXsltEngine.cs:line 112",
        "RemoteStackTraceString": null,
        "RemoteStackIndex": 0,
        "ExceptionMethod": null,
        "HResult": -2147024809,
        "Source": "Origam",
        "WatsonBuckets": null,
        "ParamName": null
    },
    "HelpURL": null,
    "StackTraceString": "   at Origam.Rule.Xslt.MicrosoftXsltEngine.Transform(IXmlContainer data, Object xsltEngine, Hashtable parameters, String transactionId, IDataStructure outputStructure, Boolean validateOnly) in M:\\gitave\\origam.origam\\backend\\Origam.Rule\\Xslt\\MicrosoftXsltEngine.cs:line 234\r\n   at Origam.Rule.Xslt.AbstractXsltEngine.Transform(IXmlContainer data, Guid transformationId, Guid retransformationId, Hashtable parameters, String transactionId, Hashtable retransformationParameters, IDataStructure outputStructure, Boolean validateOnly) in M:\\gitave\\origam.origam\\backend\\Origam.Rule\\Xslt\\AbstractXsltEngine.cs:line 163\r\n   at Origam.Server.Pages.XsltPageRequestHandler.Execute(AbstractPage page, Dictionary`2 parameters, IRequestWrapper request, IResponseWrapper response) in M:\\gitave\\origam.origam\\backend\\Origam.Server\\Pages\\XsltPageRequestHandler.cs:line 159\r\n   at Origam.Server.Pages.UserApiProcessor.Process(IHttpContextWrapper context) in M:\\gitave\\origam.origam\\backend\\Origam.Server\\Pages\\UserApiProcessor.cs:line 144",
    "RemoteStackTraceString": null,
    "RemoteStackIndex": 0,
    "ExceptionMethod": null,
    "HResult": -2146233088,
    "Source": "Origam.Rule",
    "WatsonBuckets": null
}

In a case when the transformation is removed then the api works properly.

Branche 2024.10 was without this problem.

Can you, please, prepare sample in model-tests?