Endermen sometimes get the wither effect when dodging wither skulls

The bug

When an enderman avoids a wither skull, they won't take damage directly from the skull, but they still might get the wither effect.

Reproduction steps

1. Summon an enderman
2. Summon a wither skull flying towards the enderman

   /execute at @e[type=enderman] run summon wither_skull ~-2 ~2 ~ {power:[0.1d,0d,0d]}
   

   The enderman got the wither effect

Code analysis

Code analysis by FX - PR0CESS can be found in this comment.