The bug

Players will receive a small velocity when damaged by environment and poison, will making players able to jump up 1.5 blocks.

How to reproduce

1. Placing a fence on front of you.
2. . Give you fire and poison effect
3. 3. Holding Jump bottom

×←You will jump over the fence.

Observed Result

Players won't receive velocity

Expected Result

Players will receive a smaller velocity and making players able to jump up 1.5 blocks.