Probably the same bug as RT #58083.
--- /dev/null
+use strict;
+use warnings;
+use Test::More;
+
+BEGIN {
+ package MooseX::Singleton::Test::Base;
+ use Moose;
+
+ package MooseX::Singleton::Test;
+ use MooseX::Singleton;
+
+ extends 'MooseX::Singleton::Test::Base';
+}
+
+can_ok( 'MooseX::Singleton::Test', 'instance');
+
+done_testing;