Can't locate object method "new" via package "CGI::Cookie"

Hi List,

I have two servers using mod_perl, both having the same modules installed and enabled; server1 got a fresh install of Debian Buster, while server2 was upgraded to Buster from Stretch.

This code :
	my $cookie = CGI::Cookie->new(-name  => 'session',
 				      -value => $session_id,
				      -domain => $hostname
	    ) ;

generates the following error on server2 :

[Sun May 31 19:54:03.053725 2020] [perl:error] [pid 30663] [client 83.113.48.133:59196] Can't locate object method "new" via package "CGI::Cookie" (perhaps you forgot to load "CGI::Cookie"?) at /home/lib/Marica/Base/login.pm line 198.\n, referer: https://marica.fr/site/abonnes/index.html

It works fine if add "use CGI::Cookie" to my module. 

What could be the reason why it works on server1 without "use CGI::Cookie" and not on server2?

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