A Tale of Two Bugs

Back in Patch 5.16, people thought Garen was an absolute nightmare. They nerfed his Q speed and some other things to bring him in line, then they fixed a bug that was giving him more damage than intended.

Then we have the assassin update, and people getting obliterated by Rengar. Turns out that one reason he was so strong so early was the bonus AD scaling from Bonetooth Necklace was using total AD instead.

Can a Rioter comment here? I understand bugs are hard to detect (remember Sona's Dimuendo that lasted four years or something with no one noticing?) but if you keep nerfing champions because of their interactions with bugs in addition to fixing the bugs, I feel like we end up with champions like Garen in his current state.

Is there any plan at Riot to try and actively work to improve bug detection on reworked champions?