I don't know how you made that determination but I think something else is happening. The following code shows that the string only gets evaled with the ref itself is called.
use strict;
use warnings;
my $code = 'print "Hello\n"';
print "BEFORE\n";
my $test;
$test->{a} = sub { eval $code};
print "BETWEEN\n";
$test->{a}->();
print "AFTER\n";
Outputs
C:\Perl\test>perl order_sub.pl
BEFORE
BETWEEN
Hello
AFTER
You can see the hello is only printed with the ref is executed and not when it is defined.
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