Since version 1.18 the oak forest biome is the only forest-type biome that will generate next to plains-type biomes. Taiga, Birch, and Dark variant forest biomes will not generate directly next to Plains or Sunflower Plains biomes. Where these biomes do generate near each other, there is a buffer between them composed mostly of the standard oak tree Forest biome.
To see on a large scale, load any seed into a biome viewer such as ChunkBase and highlight only the above mentioned biomes. When removing the standard Forest biome from view there will be a noticeable gap between all Plains and Sunflower Plains and any of the Forest variants.
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Possible, but this was a noteable change from all previous versions which generated them next to each other. It also severely limits visual variety in and around plains, thus making certain build areas nonexistent.
My favorite place to build has always been on the edge of a taiga bordered by plains. That is now impossible.
Thank you for your report!
However, this issue is Working as Intended.
The report you have submitted is working as intended: Biome temperature is used to group biomes in such a way that the player feels like they are in a cold region of the world (taiga, snowy plains, etc) or in a hot region of the world (deserts, badlands, etc). Temperature is a very slow noise, so once you are in a cold region for example it will tend to stay that way for quite a distance. So that is why we do not see a taiga next to plains anymore, because the temperature is vastly different in these two biomes.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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Seems WAI.