One of the biggest plot holes Dexter: New Blood introduced was completely ignored by Dexter: Original Sin, three years after the fact. Retroactive continuity changes, or retcons, are no stranger to long-running franchises. After multiple seasons spanning several years, most shows accidentally change something that was previously established at least once. Dexter had been mostly free of retcons for a very long time, until Dexter: New Blood introduced a major plot hole that also changed the franchise’s history. However, just three years after New Blood, Dexter: Original Sin has changed it again.

https://screenrant.com/dexter-original-sin-new-blood-plot-hole-ignore-explainer/