Maybe I just didn't notice this in the previous beta, or maybe I noticed it and just didn't realize what was causing it, but if your focus moves to the sidebar (by pressing the down arrow) and then you press the right arrow to focus into the details, you cannot press the left arrow to get back to the sidebar because the text carrot is still in the search field, so you need to arrow all the way to the beginning of your search term before the left arrow allows you to move back to the sidebar.
Example, if your search term in "goog" and you arrow down to your first "Google" entry, then press right, if you press left the carrot moves to "goo^g", in search, then "go^og", then "g^oog", then "^goog", before finally moving your focus back to the sidebar.
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