I disagree that this is a 4-kyu kata, if there are other regex katas that require lookahead knowledge that are 5-kyu. This should be downgraded or the harder ones should be upgraded.

Hello, one of the random tests created this:
'k@|1507718HuN6SO!/@02809591400549', and gives as correct answer: 'k@|1507718HuN6SO!/@028095914005410'

Which I suppose is wrong, as the successor should be 'k@|1507718HuN6SO!/@02809591400550'

Am I misunderstanding something?