Deathmark Resisted T5 Sith Raid P1

Product: Star Wars: Galaxy of Heroes
Platform:Android Phone
What type of device are you experiencing the issue with? Pixel 2
OS Version Latest version
Ally Code: (Find it here: http://bit.ly/AllyCode ) 687355491
What type of issue do you have? Gameplay
How often does the bug occur? Occasionally (10% - 49%)
Summarize your bug Deathmark from Death Trooper being resisted by Nihilus in P1 T5 Sith Riad
Steps: How can we find the bug ourselves? Play T5 of the Sith raid with a G10 mid-level mods Sith Trooper and try to apply death mark multiple times in a single attempt.
Connection Type Wifi
Please select your region North America
Country USA

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I assembled a rag-tag team to do some decent damage in t5 sith raid, nothing crazy. Thrawn G12 lead, Magma Trooper G8, Death Trooper G10, JC G8, Chirrut G8. I was hoping to be able to take advantage of the Machine Gun Magma Trooper team, which worked out well for my first deathmark, but then when I tried to apply Deathmark again after Death Troopers cooldowns reset, it didn't stick!

I thought, maybe I missed something and somehow Nihilus took 2 turns while I wasn't looking (I was distracted at the time). Once my cooldown reset again, I made sure to pay close attention to what would happen after using Terminate. Deathmark didn't stick that time either! I reread the description and it sounds to me like tenacity should have no impact on the success rate of this debuff sticking, is this a bug, or an attempt to nerf this team? Just curious.