Issue when digit special characters

[Lorenzo Vitali]

In a server Ubuntu 16.04 I have installed MySQL 5.7.31.

To setup UTF8 in MySQL, I have changed the following sections.

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
character-set-client-handshake = false #force encoding to uft8
character-set-server=utf8
collation-server=utf8_general_ci

Running the instruction

show global variables like '%char%'"

I can see that MySQL appears to be well configured.

character_set_client utf8
character_set_connection utf8
character_set_database utf8
character_set_filesystem binary
character_set_results utf8
character_set_server utf8
character_set_system utf8
character_sets_dir /usr/share/mysql/charsets/

And also running the instruction

SHOW VARIABLES LIKE 'collation%';

collation_connection utf8_general_ci
collation_database utf8_general_ci
collation_server utf8_general_ci

However, when I enter into the default console of MySQL

mysql -u root -p

I cannot digit the special characters (like ù or à).

Furthermore, if I paste a simple select like this one

select * from TableA where name like '%testà%';

the text inside the like instruction became '%test%' instead of '%testà%' (the special characters à is not preserved).

After many investigation, I have found that if I comment out the part for UTF8 in [client] and [mysql] configurations then I can re-digit the special characters.

Why have I this behavior?

Is it maybe a bug of this version?

Can I safety remove the configurations about UTF8 from the sections [client] and [mysql]?

Many thanks.