Why doesn't the Discover 'Sort by Date (newest first)' work correctly?

For some searches, changing the Discover 'Sort' option (top-left) to 'Sort by Date (newest first)' returns incorrect/inconsistent results.  An old article features above the new.

The workaround is to instead use the Publication Year filters (left-hand filter option towards the middle).  Either the 'Last 5/10/25 Years' or a 'Custom Year Range' and the 'Sort by Date (newest first)' provides the correct results (eg those resources published in 2023 first).

Apologies this is a known issue that our suppliers are investigating.

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