I have proposed a salsa MR to skip the offending tests at https://salsa.debian.org/php-team/pear/php-dragonmantank-cron-expression/-/merge_requests/1.
I also forwarded the patch upstream with an explanation on why the tests should be skipped at the moment [1]. [1] https://github.com/dragonmantank/cron-expression/issues/133 -- Athos Ribeiro