The issue here is the MaximumCandidates property of the RecurrenceRule. By default it's set to 3000, and in your case this only results in 98 occurrences being found. Try increasing the property to 100000 for instance and you should get more results. For example:
rrule.MaximumCandidates = 100000;
var count = rrule.Occurrences.Count();
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