I have noticed this on occasion before - but it seems random.

Sometimes a post does not show up for ages after its date suggests it should.

An example from today: a post date-stamped Mon 29 Jun 2020 11:36 in Technical was not displayed for me either yesterday or first thing (at 8:00) today.

It was another request for a Ford radio code, replied to by Galaxy at 10:10 today. It would be interesting to know when Galaxy first saw it.