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I found there are about 200 of snow depth observations and 400 of 2m temperature observations affected by this bug (at 0 UTC on 3 Dec 2020). You can see the list of affected observations in affected_points.xlsx (note that this list comes from a 49r1 experiment including snow DA changwschanges). In order to modify the bug, it seems to be better to sort observations in ascending order by latitude directly.
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