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I really apologize about this issue. We made an update to the Email tool and had unforeseen consequences in the Email Events. Our recommendation is to upgrade to the 2019.3 patch release, 2019-3.5.17947. I know this is incredibly frustrating after having just upgraded your Designer build. Again, I apologize about this issue, it was of course not our intention to break this functionality.
Please reach out to me with additional thoughts, concerns, questions.