There are instances in which one can still find small biomes generated in a world:

• In the first example, in the Minecraft Version 1.18 world with seed 6604711960869259740, approximately at the coordinates x=-6,944 and z=4,128, there lies a Small Ocean trapped in the middle of land and connected to a river.
• In the second example, in the Minecraft Version 1.18 world with seed 6604711960869259740, approximately at the coordinates x=-5,510 and z=5,764, there lies a really Small Grove trapped in the middle of a larger birch forest.
• In the third example, in the Minecraft Version 1.18 Large Biomes world with seed 937576522152241245, approximately at the coordinates x=1,044 and z=1132, there lies a patch of forest (a Small Forest) disconnected from the rest of the forest and surrounded by the beach biome. (Although I am not sure if this third example could also count as an instance of the Small Biomes referred to in examples One and Two)