Foxes spawned in the incorrect biome

The bug

The Foxes spawned in a plains/river biome and not in the snowy taiga.

(Note from [Mojang] Matthew Gatland: there are a few blocks of snowy taiga in the corner of the chunk where they spawned.)

How to reproduce

Seed: 5065972378046467357
Coordinates: /execute in minecraft:overworld run tp @s -1368.57 64.00 -9713.01 217.95 16.80