Why are variable names lost in triggers?

Question

MySQL

There is MariaDB 10.3. In the database triggers like:

BEGIN
    DECLARE _statusName VARCHAR(32);
...

In phpMyAdmin it looks like this:

BEGIN
    DECLARE  VARCHAR(32);
...

Ok, phpMyAdmin is buggy? I try dbForge Studio for MySQL - the same thing is there and highlights errors, I do a dump:

mysqldump -u... -p... --routines --no-create-info --no-data --no-create-db --skip-opt dbname > triggers.sql

Everything is ok, everything works fine. Such a problem with all variable names. I try to declare names without underscores - everything is ok. What's the magic? How to treat?
PS Previously, MariaDB 5.5 was installed, everything was fine.