Renekton shield break vs TK

So I'm not sure if this is on purpose or? But the shield break mechanic with renekton, doesnt work against the Kench's E (thick skin). It was my first time in that match up since the changes and thought perfect if I can hold onto some rage and hold my W I should destroy this match up. Too my dismay, the shield was not broken and he ate the dmg and me like a Champ. Was this intentional or is it a bug?
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