EF Core with linkqkit cannot translate EF.Functions.DateDiffDay in Sum() method

Question

I'm using the LinkqKit library and getting an error when I try to translate this code:

public static Expression<Func<Unit, int>> CalculateTimer()
{
  return x => x.Statuses.Sum(s => EF.Functions.DateDiffDay(x.CreatedAt, DateTime.UtcNow));
}

The error says

Translation of method 'Microsoft.EntityFrameworkCore.SqlServerDbFunctionsExtensions.DateDiffDay' failed

Hovewer without Sum it works just fine

public static Expression<Func<Unit, int>> CalculateTimer()
{
  return x => EF.Functions.DateDiffDay(x.CreatedAt, DateTime.UtcNow);
}

Also it works just fine (with Sum) when not using LinkqKit