in reply to Backward compatibility of code problem
That depends on what the problems are. Most of the monks here haven't yet invested the thousands of hours of meditation necessary to become psychic diagnosticians of Perl problems.
The text of the error message might help.
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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Seekers of Perl Wisdom