Darth Nihilus under EP

I noticed that having Emperor Palpatine lead sith allies recover 20% of their max health when they inflict a debuff on their turn. Since Darth Nihilus inflicts a damage over time at the start of his turn to a random enemy he should also recover 20% of his max health. Testing in galactic wars showed this was not the case and even though a debuff was applied no health was recovered. Can anyone else confirm if this is the case and should be fixed?