There are a lot of villagers in Animal Crossing: New Horizons, but only a maximum of 10 villagers can live on the player's island. It can also be recruited from Island Tours, campgrounds or other islands. When the ACNH Nook Miles Ticket villagers leave, players can meet them again.
When a villager decides to depart an island, it'll take them some days to clean up their things, which the Animal Crossing community refers to as being "in boxes."At now, two things can happen: a unique player can ask them to maneuver in, "adopting them," or the villager are "voided" - i.e. they'll move away and will not attend another island immediately. Some villagers who move into The Void will move in empty plots on recent visitors' islands; other times, they'll stay within the Void.
If a villager who accustomed carries on a player's island gets voided and doesn't auto-fill an empty plot on another island, the player may encounter them again on a Nook Miles Island Tour. If players encounter a voided, former villager on a mystery island, the villager recognizes the player.
The fact that some villagers display continuity in their memories can make encountering them again an awfully awkward experience, especially if players hated that villager and tried really hard to urge them to depart. Villagers are generally happy creatures who rarely get annoyed with the player, but encountering them again can still feel unpleasant. BuyBellsACNH.com is the safest, most convenient and best way to buy virtual currency online. Their ACNH Bells are all obtained by hand, which is very safe and reliable.
The same memory continuity occurs when another player adopts a villager while they're in boxes. If a player visits the one that adopted their villager, that villager will recognize them. However, if a player encounters this villager on an Island Tour, the villager won't recognize them. Kind of like when players encounter villagers who carry on their islands elsewhere, this version of the villager won't know the player.
It will be embarrassing to meet the villagers of the void in Animal Crossing: New Horizons, but it will feel strange to see villagers of other versions. Once again, the situation of being knocked down by the villagers is indeed terrible. But from a technical point of view, the probability of this situation is very small, so don't worry.