Poet's Pen not casting 2nd attack when getting fractionally close to 4.00 APS

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HiddenoO wrote:

Secondly, this topic is about spells not triggering on every attack when your APS is below 4 APS and can be reproduced no matter if you use two poet's pens or only one. For my current setup in particular (with 15% cooldown recovery speed), the theoretical cap is 4.6 APS but in practice I can get up to 4.34 and still trigger on every cast but once I surpass 4.36 (+1% increased attack speed), I'm skipping a cast every few attacks.