Summary: 

Striders don't shiver when they get out of lava. Their texture do change but they don't shiver.

Repro Steps:

1. Go to the nether through a portal

2. Spot a Strider out of lava or summon a Strider using a spawn egg

Obeserved Results:

Striders will not shiver if they get out of lava

Expected Results:

Striders should should get cold and shiver if they aren't in lava