A buildreq of perl(YAML::Tiny) has recently been added to perl-Module-Build. However, YAML::Tiny is not actually used by Module::Build or its test suite. As per upstream's changelog, YAML::Tiny has been superseded by CPAN::Meta::YAML in Module::Build, and CPAN::Meta::YAML is already a buildreq.
This is an issue because some of perl-YAML-Tiny's build dependencies need Module::Build for their build process, i.e. there are circular build dependencies as things stand. Please remove this redundant buildreq.
Thanks for alert. Indeed, the module is not used. I also checked other build-requires.