It's not a glitch, you just don't know your item interactions.
https://www.youtube.com/watch?v=7BuMp5h9Mhg
Recently, Rossboomsocks and SoloRenektonOnly uncovered a "bug" relating to Frozen Heart and Liandrys. It's not a bug.
Remember, ten years ago, there was an entirely different dev team at Riot. The OG team came from games like World of Warcraft, where much of the abilities and skills take heavy reading in order to learn how things work, to find complex strategies and loopholes to maximize your DPS. If you're not a WoW player and you watch someone playing high level WoW content, you'll probably have zero clue when they get CCed, debuffed, or buffed.
The new team working on League aims to have everything available for easy, visual clarity so you don't have to do much reading (you still SHOULD, there's lots of hidden power in items and kits. I've been playing for nearly 10 years, and I only just learned about Zed's damage spike passive.)
This feature between Frozen Heart and Liandrys has been used by us in the tank community for years, and helped us keep relevant in the era of damage creep. I know, most of you don't care because you just want to play your assassins and instagibbers, but it's necessary to bring the fact to light that this is not a bug, it's a relic of the past that has helped keep tanks from falling out of use entirely.
Woof.

on her. It's a fun build and with Sivir getting a little bit of buff this patch, I feel like she's a nice sleeper pick top lane.
is super good on him.