How to build several left join query in Entity Framework Core

Question

Consider i have below entities:

    public class Root
    {
        public long Id { get; set; }
    }

    public class School : Root
    {
        public long StudentId { get; set; }
        public Student Student { get; set; }
        public Teacher Teacher { get; set; }
        public long TeacherId { get; set; }
    }

    public class Student : Root
    {
    }

    public class Teacher : Root
    {
    }

Now, after this fix in EF i can build left join query like this:

ctx.Schools
    .GroupJoin(ctx.Teachers, school => school.TeacherId, teacher => teacher.Id,
        (school, teachers) => new { school, teachers })
    .SelectMany(info => info.teachers.DefaultIfEmpty(),
        (info, teacher) => new { info.school, teacher })
    .Where(info => info.school.Id == someSchoolId)
    .Select(r => r.school);

or like this:

from school in ctx.Schools
    join teacher in ctx.Teachers on school.TeacherId equals teacher.Id into grouping
    from t in grouping.DefaultIfEmpty()
    where school.Id == someSchoolId
    select school;

The sql produced is:

SELECT [school].[Id], [school].[StudentId], [school].[TeacherId], [teacher].[Id]
FROM [Schools] AS [school]
LEFT JOIN [Teachers] AS [teacher] ON [school].[TeacherId] = [teacher].[Id]
WHERE [school].[Id] = @__someSchoolId_0
ORDER BY [school].[TeacherId]

But(!), when i try to add one more table to left join

ctx.Schools
    .GroupJoin(ctx.Teachers, school => school.TeacherId, teacher => teacher.Id,
        (school, teachers) => new { school, teachers })
    .SelectMany(info => info.teachers.DefaultIfEmpty(),
        (info, teacher) => new { info.school, teacher })
    .GroupJoin(ctx.Students, info => info.school.StudentId, student => student.Id,
        (info, students) => new {info.school, info.teacher, students})
    .SelectMany(info => info.students.DefaultIfEmpty(), 
        (info, student) => new {info.school, info.teacher, student})
    .Where(data => data.school.Id == someSchoolId)
    .Select(r => r.school);

or

from school in ctx.Schools
    join teacher in ctx.Teachers on school.TeacherId equals teacher.Id into grouping
    from t in grouping.DefaultIfEmpty()
    join student in ctx.Students on school.StudentId equals student.Id into grouping2
    from s in grouping2.DefaultIfEmpty()
    where school.Id == someSchoolId
    select school;

Threre two separate sql queries produced:

SELECT [student].[Id]
FROM [Students] AS [student]

SELECT [school].[Id], [school].[StudentId], [school].[TeacherId], [teacher].[Id]
FROM [Schools] AS [school]
LEFT JOIN [Teachers] AS [teacher] ON [school].[TeacherId] = [teacher].[Id]
WHERE [school].[Id] = @__someSchoolId_0
ORDER BY [school].[TeacherId]

Looks like there are client-side left join appears.

What am i doing wrong?