His team was falling apart, but also him forcing chamber wasn't an agent that complimented his skills.
cNed during champs was the best Jett in the world, and he had no competition for how dominant he was. After that his team was falling apart, then him trying to force a chamber wasn't the best plan. On defence it was fine, on attack they didn't have the setups to play aggressive.
cNed at his best was on Jett. On chamber he was just another chamber player amoungst a sea of them, and he didn't stand out anymore. there may have been more factors involved, but the second he went back onto Jett, he started to shine again. cNed was always great at dashing in site and playing his life, over waiting for picks on chamber, or having to get a shot then tp out. It's no secret that chamber messed with a lot of previous Jett mains, with making them change their playstyle due to limited aggression on him during attack rounds.