If multiple posts has same date, get_previous_post() and get_next_post() returns only first/last of them

[oskarijarvelin]

get_previous_post() and get_next_post() both uses get_adjacent_post() -function, which uses date for query. If query return multiple posts for same date, function only returns first or last post depending on $previous -parameter. As a result, if you have multiple posts for a same date, get_previous_post() and get_next_post() functions does not work as meant to.

Found one mention about this issue about a year earlier: ​https://wordpress.stackexchange.com/questions/330276/get-next-post-and-get-previous-post-return-wrong-posts

[joyously]

I have seen this in the Theme Unit Test data, because several posts were artificially given the same date/time. It probably does not come up much in real life to have the exact same date/time on multiple posts. But it is still very confusing when it does happen.

[talldanwp]

Potentially a duplicate of #42936?

[kitchin]

Duplicate of #32651.

#42936 is also a duplicate but is held up by irrelevant work on WP_Query (in my opinion).
See: 42936#comment:22

[SirLouen]

Same to #8107, #32651 and #42936

Test report:
https://core.trac.wordpress.org/ticket/42936#comment:25

Closing as duplicate.