Onryō - Ability kill does not count towards "Execution" tome challenge

Madjura

To reproduce:

• Have the "Execution" challenge active (Kill 12 Survivor(s) by any means - Tome 10)
• Kill a Survivor with the max Condemned stacks with the ability
• The kill does not count towards the challenge

I killed four Survivors that game, one through the ability, the other 3 through hooks. I got +3 progress, not the expected +4.

As the challenge says "by any means" the ability kill should count, but it seems like it does not.