DateTime::Set is fine to use, but calendar math has these mysterious details, and recurrence specifications are particularly hard.
The specialised "DateTime::Event" subclasses can make life easier. DateTime::Event::Sunrise and DateTime::Event::Cron are other nice examples.
About the endpoint that makes it work: when both endpoints of the set are known, it triggers an optimisation that pre-calculates the whole set. The internal representation then changes to a list. This "fixes" the problem, because no further recurrence math is involved.
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