I was playing on a superflat world in the first 1.20.3 pre-release and I tried to use the fillbiome command /fillbiome ~5 299 ~5 ~-5 319 ~-5
minecraft:snowy_plains and it came back with this:
[media]It's not just a text error, the game actually changes the biome
[media]This bug also occurs for
/fillbiome ~5 297 ~5 ~-5 319 ~-5
/fillbiome ~5 298 ~5 ~-5 319 ~-5
and for any vanilla biome (haven't checked using datapacks or other custom biomes)
Can also confirm 1.20.2 and 1.20.3 pre-release 2
Does anyone have any idea why the game outputs that the first y value was 296 even though I made the first y value 299?
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The command did work, you just set the y position to 297 for the first corner and 319 for the second. Biomes are 3D now so that's why you aren't positioned in the biome, it's because it's way above you.
Cannot reproduce, see my demonstration with a proper command:
/fillbiome ~5 ~5 ~5 ~-5 ~-5 ~-5 minecraft:taiga
Biomes aren't saved per block, but rather roughly per 4x4x4 blocks (these are not aligned to each other and are instead blended by the game). The coordinate values you entered are slightly different with the output as it had to change all values in your area, and by extension a bit more outside of it.
The command ensures your selected area, and outputs the full area.
Can confirm