Hi,

On a V10.2 build that is to go live in a month, we've lost the ability to embed forms or edit forms that have already been added to pages.

Instead of the expected 'Select macro' UI to insert a form, we now get a error:

Sequence contains more than one matching element

Possibly unhandled rejection:

{
    "errorMsg": "Failed to retrieve macro parameters for macro with id  1",
    "data": {
        "ExceptionMessage": "Sequence contains more than one matching element",
        "ExceptionType": null,
        "StackTrace": null
    },
    "status": 500
}

This is the call the backend makes to render the expected UI that now fails:

/umbraco/backoffice/umbracoapi/macrorendering/GetMacroParameters?macroId=1

We have one custom theme that we specify when we add forms to pages.

Any help will be much appreciated,

Ross