[GAMEPLAY] Tryndamere's Undying Rage countered by Stalker's Blade

Tryndamere's Undying Rage says he refuses to die and stays on 1 health for 5 seconds but Stalker's Blade and other jungler items that allow Smite to be cast on champions dealing true damage are still able to kill him. This makes Tryndamere substantially weaker in any team fight or when he gets ganked. Pretty much any jungler that knows of this bug can get a free kill on Tryndamere using Smite.

How to Recreate:

1. As a jungler, or any Champion with Smite, get a jungler item that allows your Smite to be used against other Champions dealing less true damage to them.
2. As Tryndamere use Undying Rage and get to 1 health (at this stage Tryndamere should be immune to all damage).
3. Use Smite from point 1 on Tryndamere when his Undying Rage is still active.

Concerning the frequency of this bug, it happens to me every time the above method is used. Lastly, if Tryndamere dies through the above method, his ultimate still goes on cooldown.