Taunt and Challenge changes - bug?

[Illuminati]

Taunt now disappears on being attacked instead of the tank taking damage. I entered this in Github. Note: Taunting provides a damage bonus to dots, etc. on the taunted target for its duration. This has significant impact on tank playability in PVP and PVE.

Challenge range seems to have reduced from 55' to lower? I need help to verify the before and after.

Thank you

[Fenris78]

I also noticed that behavior from Taunt, been a very long time like that I'm afraid.

And yes I'm sure it's supposed to be removed by landing hits, not only attacking you.
Taunt is nearly instant removed by any channel and by bosses/lords for example.