You cant cure Poisontraps with Antidote Elixirs
(1) Place a Poisontrap below Person A
(2) Person A uses Antidote
(3) Poison didnt get removed

Poison traps stack with any other Poisondebuff
(1) Place a Poisontrap below Person A
(2) Use Toxic Flood from Witch
(3) Poison from Traps and Toxic Flood stacks

This is in the game since beginning but wasnt a problem until recently where they buffed the mentioned trap on GL from 100dmg/2sec to 350dmg/2sec
Original BDFoundry