What I expected to happen:
Trees would only generate if their trunk is in the right biome, or in some cases some intermingling is allowed (forests - taiga - jungle)
What actually happened:
❌ Some trees generated in the wrong biome.
This is not completely an issue between taiga and forest with nothing between, but across a river or a swamp tree halfway up the side of a mountain (completely in the biome) is a bit weird.
Seeds:
1128660967236217397 last 4 screenshots
7500019863313131354 first 2, (-157,99,-37)
duplicates MC-131808