mangos zero Hunter Talent - Entrapment

Gist of problem: Hunter Survival talent 'Entrapment' procs off ANY source of damage over time, and does not trigger from Frost Trap as it should.

Found/tested on: Covenant WoW - Using World DB: Version: 21, Structure: 14, Content: 67

Entrapment 5/5: Gives your Immolation Trap, Frost Trap, and Explosive Trap a 25% chance to entrap the target, preventing them from moving for 5 sec.

What does work: Immolation Trap and Explosive Trap both trigger the talent correctly, allowing multiple entrapments per damage over time effect. Entrapment is not affected by diminishing returns on Zero and this is correct as diminishing returns were not added to the talent until Burning Crusade: Source

What does not work: Frost Trap does not trigger Entrapment at all, and it should be able to trigger entrapment multiple times with a chance each 'pulse' if the enemy stays within the frost AoE.

What is working incorrectly: Entrapment is triggering off ANY source of damage over time including hunter stings, and trinkets such as 'Chained Essence of Eranikus'.

Proof of use: Plops PvP video on Youtube
This video is from a 2006 Hunter pvp showcase by Plops, who can be found at Warcraft Movies here

Timestamps:

0:37 Frost Trap activates
0:47 Rogue is entrapped
-
1:10 Frost Trap activates
1:13 Warrior is entrapped
1:20 Warlock is entrapped
1:31 Warlock is entrapped a second time