Despite the the Minecraft snapshot 25w02a changelog listing warm pigs as spawning in windswept savannas, the pig variant spawning in that biome is actually the temperate pig. Note that pigs spawn naturally in windswept savannas, so this issue can be reproduced with both spawn eggs like in MC-279235 and natural spawns.

Steps to reproduce

1. Teleport to a windswept savanna (/locate biome minecraft:windswept_savanna)
2. Get a pig spawn egg
3. Spawn the pig
4. Observe that the spawned pig is a temperate pig as opposed to the expected warm pig