PredicateBuilder - InvalidOperationException for navigation property

[thiagomoises]

Hi,
I am using PredicateBuilder to create a custom filter in my application.
If I add a filter with a navigation property, I have an InvalidOperationException

The LINQ expression 'DbSet<Announcement>
    .Join(
        outer: DbSet<AutoPart>, 
        inner: a => EF.Property<Nullable<Guid>>(a, "AutoPartId"), 
        outerKeySelector: a0 => EF.Property<Nullable<Guid>>(a0, "Id"), 
        innerKeySelector: (o, i) => new TransparentIdentifier<Announcement, AutoPart>(
            Outer = o, 
            Inner = i
        ))
    .Join(
        outer: DbSet<VehicleModel>, 
        inner: a => EF.Property<Nullable<Guid>>(a.Outer, "VehicleModelId"), 
        outerKeySelector: v => EF.Property<Nullable<Guid>>(v, "Id"), 
        innerKeySelector: (o, i) => new TransparentIdentifier<TransparentIdentifier<Announcement, AutoPart>, VehicleModel>(
            Outer = o, 
            Inner = i
        ))
    .Where(a => !(a.Outer.Outer.IsDeleted) && (int)a.Outer.Outer.Status == 0 && a.Outer.Outer.Title.ToString().ToLower().Contains(__ToLower_0) || a.Outer.Inner.Description.ToString().ToLower().Contains(__ToLower_0) || a.Inner.Description.ToString().ToLower().Contains(__ToLower_0))' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to either AsEnumerable(), AsAsyncEnumerable(), ToList(), or ToListAsync(). See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.

It's my code:

var predicate = PredicateBuilder.New<Announcement>(x => !x.IsDeleted && x.Status == Enums.AnnouncementStatus.Listed);
predicate.And(x => x.Title.ToString().ToLower().Contains(filter["term"].ToString().ToLower())
                //if I remove this list everything works
                || x.AutoPart.Description.ToString().ToLower().Contains(filter["term"].ToString().ToLower()) ||x.VehicleModel.Description.ToString().ToLower().Contains(filter["term"].ToString().ToLower())
                );

var announcements = this.DbContext.Set<Announcement>()
                        .AsExpandableEFCore()
                        .Include(x => x.AutoPart)
                        .Include(x => x.VehicleModel)
                        .Where(predicate)
                        .OrderByDescending(x => x.PostDate)
                        .Skip(Math.Max(pageIndex - 1, 0) * pageSize)
                        .Take(pageSize);

if I remove:

x.AutoPart.Description.ToString().ToLower().Contains(filter["term"].ToString().ToLower()) 

and

x.VehicleModel.Description.ToString().ToLower().Contains(filter["term"].ToString().ToLower())

everything works normally

Environment:
NetCore 3.1
LinqKit.Microsoft.EntityFrameworkCore 3.0.0
Microsoft.EntityFrameworkCore 3.1.4

Tanks