Hunter - Freezing Trap is broken

It always used to remove existing damage over time on a target that is in combat, now it doesn't and I'm not sure if it is the case only with Survival DOT or just with everything in the game, this makes pvp aspect of hunter very useless, especially in arena

some people say it works for them in pvp as intended
could be a problem with warmode turned off?
(not using Diamond Ice talent btw, but it shouldn't make any difference, the tradeoff is immunity to all received damage for a shorter duration - turning the simple CC effect to something like Cyclone effect)

I'm pretty sure it is not the random azerite spells or trinkets breaking it, existing DOTs actually stay on the target after it is frozen.