Morgana Black Shield and Zoe Sleep interaction

The updated Morgana seems to have a buggy interaction with Zoe's sleepy trouble bubble. I remember it was intended that the shield would only prevent the sleep CC if it was cast before that ability landed, however after the update, Morgana is able to cast the blackshield after the ability has hit and is sometimes able to prevent the sleep from triggering. I say it's a bug because it's only happened in that one game (consistently albeit), and in every other game the sleep has activated.
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