Currently if using 'Sort by' > 'Ascending' use the following as a work around: Either: click twice on the 'Date' column header to force the sort to focus on newest mail at bottom. OR : if you have selected any email in Message List use 'Ctrl'+End' keys on keyboard to force scroll to bottom.
Bug 1845934 Comment 5 Edit History
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Currently if using 'Sort by' > 'Ascending' use the following as a work around: Either: click twice on the 'Date' column header to force the sort to focus on newest mail at bottom. OR : if you have selected any email in Message List use 'Ctrl'+End' keys on keyboard to force scroll to bottom. Or select another another folder and then reselect original folder