Summoning mob with temperature variants with any NBT defaults them to temperate.

When summoning a mob that has variants based on the biome temperature, if it is given any custom NBT it will default to the temperate variant, rather than inheriting the variant from the biome temperature.

Steps to reproduce:

1. Go to a cold biome, and summon a mob with temperature variants, such as a pig, cow, or chicken with no custom NBT
   /summon minecraft:pig ~ ~1 ~

2. Observe that the mob inherits the proper temperature variant texture.

3. Summon the same mob but add any custom NBT to the command, whether {NoAI:1b}, {Invulnerable:1b}, or even empty curly brackets {}
/summon minecraft:pig ~ ~1 ~ {}

4. Observe that the mob uses the temperate variant texture rather than the correct temperature variant.

Note that specifying the variant in the command does work.
/summon minecraft:pig ~ ~ ~ {variant:"minecraft:warm"}