Json-data is empty without any error when inserted in database from psycopg2 and python3

I have the problem with inserting data to the ONE column of the table in the database.

I use psycopg2 and python3.6 to try to insert data to the table. The data for inserting has some params of different types: str, int, json etc.

My query is:

UPDATE i_proc 
SET ad_info = '{"codes": ["P12", "P14"], "score": 3, "score2": 0}',
    result_code_id = 33,
    status = 'wait'
WHERE id=122;

If I do it from the graphical database management tool (dbeaver) all is OK: all values correctly insert up into columns. Without any errors or somthing else.

But if I do it from python:

from psycopg2._json import Json

ad_info = Json(additional_info)

cursor = conn.cursor()
cursor.execute(
    ("UPDATE i_proc SET status = '{status}', result_code_id =33, \
                ad_info = {ad_info} \
            WHERE id = {id};"
         ).format(
            status=status,
            id=id,
            ad_info=ad_info
        ))

cursor.close()
conn.commit()

Then all of values will be inserted into the table EXCEPT ad_info! Without errors etc. This row will has status is 'wait' and id is 33, but ad_info will be empty.

To run from dbeaver I use the same SQL-query that was taken from log of python code running. Therefore it is the identical query.

As well, I has another part of code in other part of project where I use bjson-data and in that part identical code works fine, bjson-data correctly inserted.

Whats wrong here? Any help, please.