While traversing the lava lake on the back of a strider, I accidentally rode over one of the babies, causing the strider I was riding on to turn pale. I didn't think anything of this at first, until I noticed the strider would no longer go back into the lava, reverting to its normal state. No matter how far into the lake I got, it stayed pale and walked on top of the lava (literally).
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This is probably caused by MC-176015 and MC-176032. Walking on the baby strider raised the adult strider to a higher height. The adult strider started floating. Since the adult strider is above the lava (instead of slightly in the lava), the adult strider is cold.