Due to a programming oversight, the maxNoDamageTicks field in EntityLiving.java is no longer used.

This means LivingEntity.setNoDamageTicks​() now does nothing. It sets the value of maxNoDamageTicks, but that field is never used.

In the past, damageEntity() function in EntityLiving.java used maxNoDamageTicks:

Now, maxNoDamageTicks is set but never used.

Recommendation: Consider updating the damageEntity() function in LivingEntity.java so that it makes use of the maxNoDamageTicks field again.