Frequent issues for me which are also in the current version of Pro so perhaps not related to the Beta:
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When switching between builders I often find the the preview loads blank. I then need to refresh the page to view the preview.
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When working in a specific builder, by example the page builder, it is possible to click the button “Page Builder” to open up the menu with the list of pages. If I work in the builder for a while then this becomes unresponsive and I need to use the hamburger menu to select the “Page Builder” to be able to move to a different page.
The above to issues happen in both Chrome and Firefox.