public class BaseContext : BaseDbContext
{
    protected BaseWebsiteContext(DbContextOptions dbContextOptions) : base(dbContextOptions)
    {
    }

    public DbSet<Image> Images { get; set; }
    public DbSet<Tag> Tags { get; set; }
    public DbSet<ImageTags> ImageTags { get; set; }
}

public class Image : Entity.Entity
{
    public string Title { get; set; }
    public string Filepath { get; set; }
    public DateTime CreateDate { get; set; }

    public ICollection<ImageTags> ImageTags { get; set; } = new List<ImageTags>();
}

public class Tag : Entity.Entity
{
    public string Name { get; set; }
    public string Description { get; set; }

    public ICollection<ImageTags> ImageTags { get; set; } = new List<ImageTags>();
}

public class ImageTags
{
    public int ImageId { get; set; }
    public Image Image { get; set; }
    public int TagId { get; set; }
    public Tag Tag { get; set; }
}

modelBuilder.Entity<ImageTags>().HasKey(x => new {x.ImageId, x.TagId});

return await _dataContext.Images
            .Include(x => x.ImageTags)
                .ThenInclude(x => x.Tag)
            .Where(w => w.ImageTags.Any(x => x.TagId == tagId))
            .ToListAsync();

SELECT [x.ImageTags].[ImageId], [x.ImageTags].[TagId], [i.Tag].[Id], [i.Tag].[Description], [i.Tag].[Name]
FROM [ImageTags] AS [x.ImageTags]
INNER JOIN [Tags] AS [i.Tag] ON [x.ImageTags].[TagId] = [i.Tag].[Id]
INNER JOIN (
    SELECT [x1].[Id]
    FROM [Images] AS [x1]
    WHERE EXISTS (
        SELECT 1
        FROM [ImageTags] AS [x2]
        WHERE ([x2].[TagId] = @__tagId_0) AND ([x1].[Id] = [x2].[ImageId]))
) AS [t] ON [x.ImageTags].[ImageId] = [t].[Id]
ORDER BY [t].[Id]

modelBuilder.Entity<Tag>().ToTable("Tag");