Put the summary of the bug you're having here

What I expected to happen was...:
The Strider would fall after going off of the lava

What actually happened was...:
The Strider was floating above the lava lake

Steps to Reproduce:
1. Put a saddle on a strider and lead it to an area of lava that is 1 block higher than its original y-level
2. The Strider should walk up the lava
3. if you attempt to walk back down, the strider will not fall and will float