Villagers Dissapear

Upon loading a 20w06a world in 20w07a, villagers (that were in minecarts) have dissapeared completely, leaving the minecarts behind. I tried using a bit of structure block trickery to save a structure that included entities form a backup of the world and paste it in the 20w07a one, yet the villagers were nowhere to be seen, just the minecarts.