Duplicate row detected during DML action Row Values - snowflake-cloud-data-platform

Question

Each of our messages has a unique id and several attributes; the final result should combine all of these attributes into a single message. We tried using snowflake merge, but it's not working as expected. In the first run, we used row number and partition to determine unique records, and we inserted them. In the second run, we considered updating more than one record, but we received the error message "Error 3:Duplicate row detected during DML action Row Values: \n".
Session ERROR ON NONDETERMINISTIC MERGE=FALSE was tried, however the outcome might not be reliable or consistent.
We tried javascript deep merge, however the volume was really high and there were performance problems.
Sample code below:
create or replace table test1 (Job_Id VARCHAR, RECORD_CONTENT VARIANT);
create or replace table test2 like test1;
insert into test1(JOB_ID, RECORD_CONTENT) select 1,parse_json('{
"customer": "Aphrodite",
"age": 32,
"orders": {"product": "socks","quantity": 4, "price": "$6", "attribute1" : "a1"}
}');
insert into test1(JOB_ID, RECORD_CONTENT) select 1,parse_json('{
"customer": "Aphrodite",
"age": 32,
"orders": {"product": "shoe", "quantity": 2, "brand" : "Woodland","attribute2" : "a2"}
}');
insert into test1(JOB_ID, RECORD_CONTENT) select 1,parse_json('{
"customer": "Aphrodite",
"age": 32,
"orders": {"product": "shoe polish","brand" : "Helios", "attribute3" : "a3" }
}');
merge into test2 t2 using (
select * from (select
row_number() over(partition by JOB_ID order by JOB_ID desc) as rno, JOB_ID, RECORD_CONTENT
from test1) where rno>1) t1 on //1. first run - unique values inserted using "=1" -> Successfully inserted unique values
//2. second run - updating attributes using ">1" -> Duplicate row detected during DML action Row Values
t1.JOB_ID = t2.JOB_ID
WHEN MATCHED THEN
UPDATE
SET t2.JOB_ID = t1.JOB_ID,
t2.RECORD_CONTENT = t1.RECORD_CONTENT
WHEN NOT MATCHED
THEN INSERT (JOB_ID, RECORD_CONTENT) VALUES (t1.JOB_ID, t1.RECORD_CONTENT)
Expected Output:-
select * from test2;
select parse_json('{
"customer": "Aphrodite",
"age": 32,
"orders": {"product": "shoe polish","quantity": 2, "brand" : "Helios","price": "$6",
"attribute1" : "a1","attribute2" : "a2","attribute3" : "a3" }
}');