When the text in the event description is too long to fit in the popup, the function that breaks the text, does so incorrectly and words get concatenated. The first image shows the words description and that have been joined together.

Setting the MaxWidth on the call to textMeasurementService.wordBreak (line 1744 visuals.ts in release 2.2.3) to an arbitrarily large width corrects the issue - but doesn't seem like the best fix. Image 2 shows the result of doing this (width multiplied by 500 in this case!).
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The issue persists in later releases, but 2.2.3 is the release currently available through appsource.microsoft.com.

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In the current version available on appsource.microsoft (2.2.3) when you play the animation for the pulse chart, if a popup is configured, it will automatically show when the animation reaches that point. In the latest version (2.2.4) available on github, the popup does not show automatically. The difference appears to be from changes made to the handleSelection function in visual.ts.