Improved Malefic Rapture does not adjust the Global Cooldown [Affliction]

[yourCuteMotoko]

Game Version:

11.0.2 live Build 56313

Description:

Improved Malefic Rapture reduces the cast time of Unstable Affliction below the GCD without modifying the GCD itself, resulting in a idle gap

Details:

Try to explain the bug.

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Reproducible:

yes

Howto:

Talent Improved Malefic Rapture and queue a second spell after Malefic Rapture