Striders get cold after reloading resource packs

The Bug

When I reload resource packs with F3+T, the striders' feet are above lava rather than soaking into it.

Reproduction

1. Find a strider in the nether.
2. Find a way to get the strider onto a lava pool.
3. Put a saddle onto the strider.
4. Ride it.
5. Get or craft a warped fungus on a stick.
6. Control the strider.
7. Press F3+T.

 It will turn purple and started shaking even it's on lava.

(Can't send screenshot because it's missing a token.)