$new::variable is a package variable belonging to the 'new' package (bad name btw). $another_variable is a lexical variable that you need to declare using 'my' because you are using strictures (use strict; use warnings; - highly recommended btw). The fix is just:
$MyPackage::variable = 1;
my $another_variable = 2;
Note that if package MyPackage uses strict it will need to declare $variable using our:
our $variable = 1;
True laziness is hard work
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