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1
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Issue can be replicated using this example: https://stackblitz.com/edit/jmvafp

Try to open the multiselect by clicking it -> the popup does not open. When clicking the list the second time, the popup does open. The issue has something to do with setting the popupHeight in the beforeOpen event, as the issue doesn't appear when it's removed.

The original goal is to calculate and set the popup height dynamically, when the list is opened.