Great comment! And factual. The instructions I took home warned that it is common to experience some short runs of AF during the blanking period. The latest research says that if this happens in the first few weeks, it is a better prognosis than if the first few weeks are AF-free and then the patient begins to get breakout AF in the last three or four weeks before the Holter monitor assessment (usually sought between 10-12 weeks, typically).
https://www.heartrhythmjournal.com/article/S1547-5271(24)00261-3/fulltext
Even so, there is wide variability, and patients need to be.....well.....patient. It may even turn out that after the Holter things improve and that the person will then go on to dozens of months, even years, before having another bout of AF. If ever.