flying strider

Put the summary of the bug you're having here

What I expected to happen was : strider will fall in lava
Describe what you thought should happen here

What actually happened was : my friend Shtosh met a strider in hell, he wanted to dip it into the lava - dump it into it, but the strider began to hang in the air (there were no invisible blocks)
Describe what happened here

Steps to Reproduce:
1. we could not solve this problem