MYSQL update query returns zero line while same select query provides result (search field IS NULL)

Question

I want to update lines with testing 2 fields. When I proceed a select query, I can see the concerned records:

SELECT * FROM `t_journal` WHERE Type IS NULL and Mouvement < 0

But when I use the same filter on an UPDATE query, MYSQL return zero line :

UPDATE t_journal SET Type = "Entree" WHERE Type IS NULL AND Mouvement < 0

I tried on a local copy of my table in MAMP with Mysql 5.7.32 (PHPMyAdmin) and also live on Ubuntu server with MYSQL 5.5.62 ... same result.

EDIT When I simulate the query this shows this result

SQL query:
UPDATE t_journal SET Type = "Entree" WHERE Type is null AND Mouvement < 0
Matched rows: 0

What am I doing a wrong ?

EDIT 2: