It is possible to replicate this issue with the default "News 360" lens as well. For instance here are the settings on the default news lens:
You can see the 'Yesterday' selection is checked.
Then I verify that the "News 360" lens is enabled and run a search for a recent news story:
In the first 6 results, only one is from yesterday ("1 day ago") or newer. 2 results are older than 3 days ago.
Not many of those results have time tags less than 24 hours, so I'll do another search. Several results across 3 sources are tagged less than 24 hours:
If I set the time filter to "Past 24 hours", only one source appears in the results:
Although some of the less than 24 hours old tagged stories from that source are reflected in the filtered results, some are not, for instance "Biden endorsed by United Auto Workers...", and "Heavy rains soak Texas and close schools...."