unexpected results of a left join - sql

Question

I have a table named test_table_1 and a view named temp_test_view_1.
The goal is to find the NEW_CATEGORY_ID for every ID in the test_table_1. The relationship between NEW_CATEGORY_ID and ID is in the view temp_test_view_1
I use the left join for that purpose, with the base table being test_table_1.
In my opinion, the left join returns some unexpected results.
Here is all the data contained in table test_table_1:
select * from test_table_1:
id name
1 'a'
null 'd'
3 'd'
2 'c'
2 'b'
Here is the view script:
create view temp_test_view_1 as
select
id,
id_description,
case when id_category = 'phone_id' then 'phone' else 'other' end as new_id_category
from (
select
1 as id,
'first id' as id_description,
null as id_category
from dummy
union all
select
2 as id,
'second id' as id_description,
'phone_id' as id_category
from dummy
) x
;
Here is the query I use to left join the view to a table and then project the results to see the corresponding new_id_category for every ID in test_table_1:
select
t1.id,
t1.name,
t2.id,
t2.id_description,
t2.new_id_category
from test_table_1 t1
left join temp_test_view_1 t2 on t1.id = t2.id
output is:
id name,id id_description new_id_category
null 'd' null null, 'other'
1 'a' 1 'first id' 'other'
2 'b' 2 'second id' 'phone'
2 'c' 2 'second id' 'phone'
3 'd' null null 'other'
desired output:
id name,id id_description new_id_category
null 'd' null null, null
1 'a' 1 'first id' 'other'
2 'b' 2 'second id' 'phone'
2 'c' 2 'second id' 'phone'
3 'd' null null null
Can someone explain whether the result the query produces is correct and why if so? I expect this left join to return null on the columns retrieved from the view, as u can see from my desired outcome.
I did not test the query in DB systems offered by other vendors.
EDIT:
I tested it on sqlfiddle MS SQL, and it produces the desired output. Here is the link:
sqlfiddle.com/#!18/1c788/2
If someone needs the code itself to reproduce the results in MS SQL, (while he will fail to reproduce the resulst and instead get the desired result):
create view temp_test_view_1 as
select
id,
id_description,
case when id_category = 'phone_id' then 'phone' else 'other' end as new_id_category
from (
select
1 as id,
'first id' as id_description,
null as id_category
union all
select
2 as id,
'second id' as id_description,
'phone_id' as id_category
) x
;
select *
into test_table_1
from (
select
1 as id,
'a' as name
union all
select
2 as id,
'b' as name
union all
select
2 as id,
'c' as name
union all
select
3 as id,
'd' as name
union all
select
null as id,
'd' as name
) x;
select
t1.id,
t1.name,
t2.id,
t2.id_description,
t2.new_id_category
from test_table_1 t1
left join temp_test_view_1 t2 on t1.id = t2.id