Management API MCP server throws ContentTypeMapper.ExtractFormComponent error

Hi all

We're using the Kentico Xperience Management API (NuGet: Kentico.Xperience.ManagementApi, preview) and calling:

GET /kentico-api/management/v1/content-types

The request fails with:

System.NullReferenceException: Object reference not set to an instance of an object.

   at Kentico.Xperience.ManagementApi.ContentTypeMapper.ExtractFormComponent(FormFieldInfo fieldInfo)

   at Kentico.Xperience.ManagementApi.ContentTypeMapper.ToFormField(FormFieldInfo formField)

   at Kentico.Xperience.ManagementApi.ContentTypeMapper.ToContentTypeFormItem(IDataDefinitionItem item)

   ...

   at Kentico.Xperience.ManagementApi.ContentTypeService.GetContentTypes(GetParameters getParameters, CancellationToken cancellationToken)

   at Kentico.Xperience.ManagementApi.Internal.ContentTypeController.Get(String cursor, Nullable\`1 limit, CancellationToken cancellationToken)

We're on Xperience by Kentico 31.1.2 (using Management API package 31.1.2-preview).

Other Management API endpoints we tried (e.g. list form components, list data types, list reusable schemas) work. Only the content-types list fails.

Could this be caused by some kind of corruption in our content type or form definitions? Has anyone else seen this before?

Thanks in advance!