Invalid cast Microsoft.EntityFrameworkCore.HierarchyId

I use GraphQl to fetch the data, here is my method in order to get the result based on category ID.

    public IQueryable<Product> GetActiveProducts( string categoryId, CancellationToken cancellationToken )
    =>
      return _dDbContext.Categories.Where(x => x.Id == categoryId);  
     

Also, my entity is as follows:

 public class Category:IEntityHierarchy
  {

    public string Id { get; set; }
    // code removed for brevity

and also IEntityHierarchy

  public class IEntityHierarchy
  {
    public string Id { get; set; }
  }

The configuration of my category entity is:

 builder.Property( x => x.Id )
             .HasConversion(
                            v =>HierarchyId.Parse( v ),
                            v => v.ToString() ) ;

When I call the endpoint, it throws an error: Invalid cast from ‘System.String’ to ‘Microsoft.EntityFrameworkCore.HierarchyId

And here is also my query:

query($categoryId:String!){
  activeProducts(categoryId:$categoryId)
  {
    id
    name
  }
}
// and query valiables
{
  "categoryId":"/2/7/"
}

I also should mention that when I directly provide the category ID in my Linq query, it works.

    public IQueryable<Product> GetActiveProducts( string categoryId, CancellationToken cancellationToken )
    =>
      return _dDbContext.Categories.Where(x =>x.Id == "/2/7/");