@bwintx It may be that I spoke too soon. Whilst I am having to improve my date handling to deal with some “other” date bugs I found I have not been able to resolve that one listing page.
The dates schema are inserted by a partial that works on other pages, and I have checked, and even copied date and lastmod dates from other md files, and still get the 0001-01-01 00:00:00 +0000 date.
Update: I have identified my issue, and created a new post here: Lastmod & Date on List Pages - Is this expected behaviour?