Place an entity from the list attached (list.txt) in a hole, then add water at the bottom of the hole, wait for the entity to "high jump" in the water and remove the water. Now the entity will jump infinitely in the hole.

Getting the entity out of the hole usually make it stop jumping after a few seconds.
Relogin fixes the issue.

This may be cause by the fact that the entity, once in water, can jump higher and therefore tries to reach a higher block to jump on. However, I am no programmer!

This bug can negatively affect some farms relying on lava placed just above baby mobs so they get automatically killed when growing up. The baby mobs, while jumping infinitely, die in lava prematurely.